So, I have an A-Line dress and when it came in I put it on without a slip and it looked beautiful, but I wouldn't mind making it a little fuller with a slip but the store didn't even offer that as an option (but I didn't ask either). So I'm wondering if you "have" to wear a slip? Or if I should, I'm just not sure. I'm okay with either way, I'm just wondering if there is a reason I need to wear one or not.