You will need to wear your bra night and day for the first week following surgery.  The bottom of the bra should be against your ribcage, not against the breasts.  The bra should only be removed for a brief shower.  After the first week, you may sleep without the bra.  We do recommend that you wear the bra whenever you are engaging in any strenuous activity for the first month following surgery.  Avoid wearing a bra with an underwire for the first month after surgery to reduce irritation.