Thanks for all the suggestions. I think I'm leaning towards the bamboo blend or a silk blend. I'm planning to go to my LYS this weekend and really look at some yarn in person. This gown will only be worn at her blessing and probably worn by any other girls I have, so not worn much, which is why I'd like something of a nicer quality. I doubt it will be heirloom quality, I'm not THAT good of a knitter, but it'll be special to me.