Originally Posted by CoyoteQuilts
Also, pre-wash no matter if you don't the other fabric. Most good muslin shrinks a tad more than regular cotton. To test spray it with water and then iron.
I agree I have had some shrink right before my very eye while ironing so it had to be quite a bit of shrinkage.
DO buy the permanent press muslin, but the bolt states even though its says preshrunk still has about 2 -3 percent shrinkage.