Bra-making Sew Along: Sewing the Cups

finished bra cups

Alrighty, how’s it going y’all? I’d love to hear. I know some are still fitting and some of you have made two or 10 bras by now! Me, I’ve made better friends with my Canon than I ever thought possible…

Before I break out the sewing machine, a couple of things that I’ve been using on my bras.

A straight stitch foot. I use my foot as the seam guide–the distance between the needle and the edge of this foot is exactly 1/4″.

straight stitch foot

Of course, don’t forget to switch to your zig-zag foot when sewing your elastic. There’s a big Ask How I Know. Which is why I have extra needles…

I use a stretch needle, size 11/75. This has been perfect for elastic and lycra, but also seems to work best on all the tricot-type fabrics. For lace I sometimes go to a very small needle. I’m always experimenting!

assemble the cups

How you proceed on your cups depends on whether you are fully lining your cup, or just lining one part (like the bottom)–or not lining at all.

On my friend’s bra, I’m using lace only on the top cup, as an overlay on the regular bra fabric (in this case, simplex from a bra kit). I want the cross cup seam allowances to be totally hidden inside the seam, so I stitched the three layers together with the lower cup sandwiched in between.

lace cup with an upper lining

lace upper cup with lining

“sandwich” turned right side out, before topstitching…

On my bra, the outer cup is entirely lace and the lining is interfaced silk charmeuse, so I constructed the two layers separately:

separate lace cup and lining

To flatten the seams, I turned the seam allowances over to one side and edgestitched onto the allowances, just a tiny width away from the seam.

sewn cup after edgestitching

Your pattern may have instructions to press open seams and topstitch on both sides. Or topstitch the seam allowances together to one side. This is really up to your preference and how thick your material is! Most often, I like to edgestitch which flattens the seam enough for me.

So when I was first starting to make bras, I struggled with rippled seams across the cup. Oh the dreaded rippled seam in knits! Since seam rippling is usually caused by one or the other layers stretching too much, here are a few things to try:

  • If your machine has this ability, try lightening the foot pressure.
  • As you are sewing, try not to pull or stretch the fabric in any way–let your hands simply be a guide.
  • Try sewing without pins! When sewing two different curves together, or concave and convex curves, pinning pulls one layer into the direction of the other which can cause the length to stretch. It takes some practice at first, easing off a pin here and there. Eventually I went cold turkey pin-free! Which has improved my curves sewing and feel for fabric handling.

finish the top of cups

At this point I want to finish the top of my cup! If you are sewing a continuous trim that finishes both the cup and bridge, you’ll wait till you’ve sewn your cups into the band.

Both of my cups have two layers on top–the scalloped lace and non-stretch lining. To finish the edge of the lining, I tried a technique based on one of my fave strapless bras. I sewed a strip of sheer tricot along the outside top of the cup with a 1/4″ seam allowance.

sewing tricot facing strip

Then I turned, and top-stitched this down along the inside. I could have done this in reverse, too–which would totally hide the seam. It’s pretty soft as it is. The tricot is cut along the least stretch so it stabilizes things a bit.

topstitching tricot facing strip

To keep the lace from shifting around on top, I tacked it down in three spots with a small back-and-forth zig zag stitch (almost like a bartack!). I saw this done in an Elle Macpherson bra and liked its invisibility.

tacking lace to upper cup

Since my bra has a vertical seam, I tacked down the lace to the lining with a couple of straight stitches right at their joining seams.

tacking lace to vertical seam

After you’ve finished the top of your cup, you can baste the layers together around remaining edges, so that the cup will be treated like one piece. I do this just inside the seam allowance–it’ll all get hidden underneath channeling and elastic! When basting stretch lace, it sometimes wants to stretch past the lining, as you can see in the above photo. It’s just the nature of stretch–I try to keep the excess toward the bottom of the cup and just trim it off!

other cup finishes

There are loads of different ways to finish the top of your cup! I’m always experimenting.

top cup finishes

l to r: foldover elastic as a binding, decollete or clear elastic along the bottom of scallops, picot or piping elastic, lace and lining layers sewn right sides together for an invisible finish (which I wrote about here).

18 Comments on Bra-making Sew Along: Sewing the Cups

  1. Ruth
    January 23, 2013 at 9:54 am (2 years ago)

    You are an inspiration to me. I am getting up the courage to try ma,king my own bra. I am nervous about it but I have you for a resource and could always ask for help. Thanks so much for all info the you are sharing.

    Reply
    • Amy
      January 23, 2013 at 11:09 am (2 years ago)

      Thank you Ruth. Please feel free to ask questions or email me when you do–I am happy to help!

      Reply
      • Naomi
        January 24, 2013 at 6:22 pm (2 years ago)

        I was just reviewing the cup finishes. What size clear elastic did you use? I’ve only seen the 3/8″ available. The finished edge in the picture the elastic appear to be narrower?

      • Amy
        January 24, 2013 at 10:49 pm (2 years ago)

        Hi Naomi, in that photo of the red bra I was using a decollete elastic from a Merckwaerdigh kit. It’s a 1/8″ soft almost ribbon-like elastic. I’ve never seen this outside of European bra kits but I really like it. I have used clear elastic, too. I have a package of 1/4″ I think I got from Joann’s or somewhere like that. You can cut clear elastic, too! I usually run a rotary cutter over it to get a very small width. It’s a good way to finish off the top of a sheer lace cup and I see that a lot in rtw.

  2. Maddie
    January 23, 2013 at 12:37 pm (2 years ago)

    Amy,
    Although I’m not participating in the sew-along, I do have a question that’s been I’ve been struggling to answer in my own bra making. Power mesh! If I’m lining both my upper and lower cup with powermesh and want the cross cup seams to be wrong sides together (or clean finished), I would have t sew the lining and self cups separately like you did in this post. What size needle and tension woukd you use? My machine does not like sewing powermesh together and and the seams have been yucky!

    Reply
    • Amy
      January 23, 2013 at 6:01 pm (2 years ago)

      Hey girl! I like that kind of lining, too. Hmmm, I have been using a stretch needle on most of the bra, including stretch mesh/powermesh and so far so good. It’s a little bit different than a ballpoint. Is the fabric bunching down into the needle plate, or is the needle not going through the fabric? (Or both?)

      One time I had a lot of trouble with needle-eating and I unscrewed my plate–there was a load of lint in there! and little threads. After I cleaned it up that really helped. Or maybe trying a smallish needle like something you’d use on silk. Let me know how it goes!

      Reply
      • Maddie
        January 24, 2013 at 7:53 am (2 years ago)

        ahh… maybe it’s the needle. I’ve been using a ballpoint. The needle is going through the fabric but it is bunching in the needle plate as if the fabric doesn’t have enough “substance” to handle the needle (it’s too flimsy) if that makes sense. I will let you know how it goes.

      • Amy
        January 24, 2013 at 10:54 pm (2 years ago)

        Yeah, I know what you mean. If it’s the sheer tricot, sometimes a little silk needle like 65 helps. It is flimsy. We’re gonna master this stuff, though!

  3. Merche
    January 23, 2013 at 6:12 pm (2 years ago)

    All so pretty! I hope I can get something that looks similar! Very inspiring, Amy.

    Reply
  4. Sewlene
    January 23, 2013 at 11:11 pm (2 years ago)

    Thanks for the instructions. It is going to be nice experimenting with the different cup finishes.

    Reply
  5. Norma
    January 24, 2013 at 8:02 am (2 years ago)

    Great fabric and lace combinations. Very pretty!
    Looking forward to seeing these bras come together.

    Reply
    • Amy
      January 24, 2013 at 10:52 pm (2 years ago)

      Thanks Norma! Are you making one, too? I’m so near the finish line.

      Reply
  6. Sharon
    January 24, 2013 at 7:11 pm (2 years ago)

    Still fitting and hope to share the revised version soon, however I am so appreciative of all your detailed posts and information.

    I had a look at my Janome Straight Stitch foot and unfortunately that is not 1/4″ so I have been using the Janome 1/4″ seam foot, so far so good.

    Reply
    • Amy
      January 24, 2013 at 10:51 pm (2 years ago)

      Thanks Sharon! Today I looked in my manual and my foot is actually called a “patchwork foot” for quilting. I didn’t even know! It just looked like a straight stitch foot… I use it more than any other.

      Reply
  7. Mia
    April 8, 2013 at 4:06 am (2 years ago)

    Hi!
    I just wanted to say thank you for having made this series. I’m sewing a bra and your series has been very motivating!

    Reply
  8. Mia
    June 7, 2013 at 12:42 pm (2 years ago)

    Me again!
    I have a question this time…I’m a bit confused about finishing the top of the cups…if the purpose is to stabilise the seam then I’m confused as to why elastic is used…surely elastic is stretchy therefore not stabilising??
    thank you again for this wonderful resource!

    Reply
  9. Amy
    June 7, 2013 at 8:56 pm (2 years ago)

    Hi Mia, good question! There are so many ways to finish the top of the cup, and it’s really up to your preference, support or style of bra. Most foam cup bras stretch a bit. Using tiny elastic along the neckline of scalloped lace is common in rtw bras.The elastic does stretch but it also rebounds, and we move around there a bit so it’s ok to have a little movement. It stabilizes by keeping the fabric within the limits of the elastic, sort of like how elastic stabilizes the leg openings of underwear, if that makes sense. But some people like to use a strip of stable tricot or a rigid lace trim along that seam–it’s really up to you!

    Reply
  10. Mia
    June 8, 2013 at 4:26 am (2 years ago)

    Thank you Amy! It makes complete sense to me now. I hope one day my bras will look as pretty as the ones you showed!

    Reply

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