In answer to your question about seersucker for quilts.
I think you could get away with it just don't iron the material or it will give on you. I sewed my 3 year old twin grandaughters some reversible summer dresses and I just happened to iron them when I had finished them well guess what the little darn dresses lost thier texture material. I didn't even notice until I my daughter got them and asked mom what happened here oh well. Hope it works for you. I know next time I won't iron them lol.