So long as that mother has a grip on reality and knows where the line is. I have no problem with a mother in teenage minded clothing (exposed midriff, cleavage, shoulders, etc..) but if you're sporting a muffin top splurging its way out of your clothing then it's not a matter of fashion, just a matter of nasty.
Really, so long as you're in the reasonable shape to pull it off, go for it.
there are limits especially at your age. my mom is 38 and i hate when dresses out of her age group there ways to look good without dressing in your teenage daughter's clothes. you encourage your daughters that revealing their body is good, sexualizing themselves? wow you're the reason why girls nowadays have no self-respect smh