An outfit that you doubt looks good on you. This realization almost always dawns after one leaves the house, eliminating the ability to change.
I thought that this dress looked good on me, but now that I'm at school it seems like more of a doubtfit.
Noun: A very unappealing outfit, that really shouldn't be worn in the presence of anyone who is able to see.
When Kylie arrived in the pub clad in purple flowery leggings, checked rubber boots, a lime green boob tube, yellow legwarmers and topped with an orange wig, her mates knew she wasn't going to pull that night. They cried in unison "What the hell are you doing in that doubtfit?"