When wearing something (an outfit) again after wearing it the day before..
Usually occurs when someone dresses really nice on the weekend and nobody really got to see it, so they wear it again to work/school on Monday.
Vanessa and Kathryn went to the mall together on Sunday.
Vanessa got all dressed up.
Monday: Vanessa wears the same outfit but only Kathryn saw her in it on Sunday.
Kathryn: Hey vanessa, i like youur 2-Day 2-Morrow Outfit ! You totally wore that yesterday!
Vanessa: Shhh! i don't want people to know !