1.Over-application of the retro look so as to appear to be wearing one's grandparent's actual clothes.
2.One who is hopelessly out of style.
"I had an online date with this girl who looked like she shopped in her grandma's closet."
"' Her Grandma's Closet', is that one of those kitschy second hand stores?" I hate that shit.
" We all do, except that would have been a major step up. I'm talking literally, here. Girl was a total grandvestite. I can still smell the mothballs."