For example, if you measured 38 inches for your hips, you’ll divide by two and you’ll come out with 19 inches for each strip. Then if you measured 10 inches for your crotch piece, you’ll just cut two 10 inch pieces of lace.
You should see a continuous seam, meaning you matched the seam of the crotch piece up with each seam on the waistband.
If you find that elastic is uncomfortable, you can always try substituting it for some stretchy lace, although it may not attach quite as well to your underwear.
When making your thong, the tip of the triangle should point down, so cut your fabric with that in mind.
Depending on where you want your thong to sit will determine if you use your hip or waist measurements, and will also determine the length of your back elastic. If you want a higher thong, you’ll need more back elastic and less elastic for your waistband, but if you want your thong to sit on your hips you’ll likely need more elastic for the waistband and less for the back elastic.
When you let the fabric go your fabric may crumple up a bit, but once you sew the elastic into it and put it on, it will stretch to fit.
