For this video we used Kwik Sew pattern number 3239.
1) To keep the lining from showing on the outside of the bikini top it’s a good idea to trim the lining piece slightly smaller than the outside piece. Here’s how to do that: overlay the outside piece on top of your lining piece (right-sides together) offsetting the piece by about 1/4” or 6mm from the bottom. Pin in place along this bottom edge and trim off the excess lining.
2) Next it’s time to sew the straps and waist tie. Fold these long, rectangular pieces in half lengthwise and stitch with a zigzag stitch. Using the method of your choice, turn the waist tie and straps pieces right-side out.
3) To prep the sides of your bikini top to be sewn together with the lining, place these pieces right-sides together sandwiching a strap piece at the top corner. Pin the top corner first through all layers and then the outside corner points (stretching the lining slightly to match). You can place a few other pins in between these points if you need.
4) Sew your lining and fabric piece together using the seam allowance determined by your pattern. Note: our pattern called for a 1/4” or 6mm seam allowance, if your seam allowance is larger than 1/4” you may want to sew your seam following the seam allowance your pattern calls for and then trim your seam allowance down to about 1/4”. For extra stretch at the strap point, you can always sew back and forth across this point a few times. Repeat the same process for the other top piece. Turn your top pieces right-side out. Topstitch the seam allowance down on both pieces with a zigzag stitch
Optional step: if you would like to insert a bra form into the bikini top, now is the time to do so. Make sure to mark with a pin on both top pieces which sides will be the outside and to hold the forms in place with pins through all the layers to keep them out of the way as we sew the bottom of the bikini top closed.
5) Sew the bikini top piece closed at the bottom with a zigzag stitch. Turn up the hem the amount determined on your pattern (our pattern said 5/8” or 1.5cm) and pin in place. Edgestitch* the hem in place from the inside of the bikini stretching the piece slightly so that the edge of the hem lies flat as you sew across it.
*You want your stitching to be as close to the cut edge as possible as shown in the after picture (inside view)
6) Feed your waist tie through both casings and centre your top pieces on the waist tie. You can knot the individual ends of your neck and waist tie pieces if you wish.
Congratulations on completing your bikini top!