Cut your pieces. If you want to make your bottoms reversible, make sure to have two different fabrics to use. In total you’ll cut 1 of the front and 1 of the back in EACH fabric. If you’re using one fabric for the bottoms, cut 2 in the front and 2 in the back.
Once you’re done, you should have 4 pieces total- 2 fronts, and 2 backs.
Match your pieces so that each front is right sides together with a back piece. If you’re using two different fabrics, have your front and back pieces matched by fabric.
With right sides together, you’ll want to pin along the gusset area at the very bottom, for both pieces.
Sew the gussets. For ONE (usually the lining piece), leave a small, 1” hole which we will use later to take the bottoms to the right side, which ultimately is what makes them seamless and reversible.
Now lay each attached piece down with right sides together. Pin all along the leg holes, making sure to leave both top seams (what will be the waist) open.
Sew the leg holes, and then go back and attach elastic right on top of where we just sewed. You could complete the leg holes and elastic in one step, but sometimes it can be difficult without an elastic foot.
After completing the elastic, take the bottoms back to the right side.
Next, we attach the sides. To do this, line up your bottoms so they sit like they would when they are completed. Grab each of the open hip seams, and open them so that right sides are matched together. Pin along each hip, and sew straight across.
DO NOT SKIP THIS STEP. Make sure your bottoms are to the RIGHT SIDE before continuing to step 8.
Remember the 1” hole we left in the first sewing step? Locate that hole. You’re going to take your bottoms to the inside-out THROUGH this hole. Don’t try to do it anywhere else except through this hole, because you won’t be able to take the suit back out later on.
Take the entire suit into the inside-out, and line them up so that you can access the open waist seam.
To sew the waist, match right sides together of the two outer layers. If you’re doing this correctly, there should be two more layers sandwiched inside, under the two layers you’ll sew. Don’t sew across the inside layers- in fact, avoid that because it will mess you up.
Sew all along the waist, and you’ll notice that as you’re sewing you’re able to pull the entire waist seam through as you’re sewing.
Once the waist is completed, locate your 1” hole again. Now stuff the bottoms back through that hole once more, taking the suit to the right side a final time.
Finish off the hole either with a straight stitch or with an invisible hand stitch!