Originally Posted by GMA
I would wash all fabric to prevent any bleeding. I have allergies and all that sizing really bothers me. I prefer to sew at the 'correct' size and have it do the shrinking on it's own. If it's a wall hanging or something that's not going to be washed that much than, probably not a big thing.
AHA!!!! I'll bet this is EXACTLY why I've had so many allergy problems this last year!! It coincides with my starting to quilt/sew a lot! WOW! This might be saving me $$$$ from going to an allergist! LOL -- more $$$$ for fabrics now!!!
To answer OP, I've decided after studying this forum, that it's best to pre-wash....only because I put SO much effort into sewing the projects that I'd be sick if one bled or shrank!