OK, I am making squares from HST's. I am having a hard time with my seams for a 3-7/8 square when cut from one corner to the other to line up. When I sew the two halves together to make a square, my square is too small.
I did measure the squares that I used to make HST's to be 3-7/8.
Now when I sew them together, they should measure 3-7/8?