Wedgie-free boxers

I bought my husband a package of 3 boxers for Christmas last year. Made in India. They all had a seam down the back that gave him wedgies. This was disagreeable. He presented me with a challenge. Could I make him wedgie-free boxer shorts? Made in USA? I took him up on the challenge since I got this great Janome sewing machine for Christmas. The 3.2.1. lift-off boxers are made from an upcycled vintage Gap t-shirt. The other pair are made from an old pillowcase. He's delighted with the 3.2.1. boxers. They are the only pair that fit. Probably because of the stretchy jersey. The other pair are too small. I found out later I was using a pattern for Japanese men.