I'm working on a dress with a strapless bodice and a gathered skirt. I'm designing my own pattern, but for an example it will have a similar shape to this dress.
From browsing online I've seen that "fancy" strapless dresses sometimes include waist stays. So I'm considering adding one, but I haven't sewn (or worn) something with one before. If the waist stay won't do anything for my dress I'd like to avoid the extra work, but I'm not sure what to check for when I try it on, to tell if it would make a difference.
When would I want to use a waist stay? What issues would it help with?