Mom wants to wear old dress to daughter's wedding

My younger sister has FINALLY gotten herself engaged to a nice man and is in the throes of the wedding planning. Our mother recently mentioned she would like to wear the dress she wore to my wedding (in 1994) to my sister's wedding. Stylistically it's your run of the mill JCPenney dress for like $60--I wasn't that excited about it for my wedding! But I don't like conflict with my mother, so never complained.

My sister does not want her to wear that (old) dress to her wedding; but also doesn't want to hurt her feelings. How can we talk to our mother without hurting her feelings? Or are we making a big deal out of something that is minor?

I'm surprised that you didn't get any answers. How did this situation work out?

If I'd seen this question I would have suggested taking her shopping for a new dress. My mother didn't like to spend money and she would have continued to insist that she didn't want a new dress but in the end she'd have a new dress and be pleased.

I hope that this worked out well for you and your sister.