|This is Malden Mills' own technique for getting around the problems with standard buttonholes on fleece. They call it a 'Bound' buttonhole (in quotes, because it's only sort of bound, and much easier). I quote from their website:
1. Cut a square of fabric from the same fabric that your garment is made. A 2" square should do the trick for most buttonholes.
2. Draw a line in the middle of the square that is the same length as the button you are going to use.
3. Place the square (right sides together) where your buttonhole is to go using the line as a guide for your buttonhole placement.
4. Stitch a rectangle around the line staying 1/8" from the line.
Here's their pic :
5. Cut through both layers on the line, then diagonally to corners.
6. Push square of fabric through to the wrong side.
7. On the right side, topstitch 1/4" around the opening.
8. On the wrong side, cut away any excess fabric.
You can use this technique for pockets, too!