Does wearing a bra make ur more likely to sag or more perky then not wearing a bra?

Your will sag over time no matter what. Large will sag more because there is more weight for the muscle and connective tissue to support. Wearing or not wearing a bra will have little to no effect on sagging, only age and weight. Strengthening your pectoral muscle can make your s look perkier and slow sagging some. Try doing some push ups or bench press.