If I had men's plaid shirts all prepared and ready to go, I'd use this nifty pattern (See link. It's a tutorial). If you want this quilt bigger for a bed sized quilt, just use more shirts and make more blocks. This pattern is on my to-do list. I like how the author gives instructions for how to cut the shirts. If your fabric is starched before you cut your pieces, and you are carefully sewing, without pulling the fabric (to stretch it), and you are carefully ironing, without dragging the iron across the fabric (to stretch it), then the bias situation is not so difficult to control. The key is to pick a pattern you like, so you will enjoy the quilt. It's not fun to put a lot of work into a quilt only to be not happy with the pattern you chose.
http://wishesandweeds.com/seven-shirts-quilt/