Sleeveless black pencil dress = Audrey Hepburn
Red long-sleeve polo shirt with white bucket hat = Gilligan
Joseph and The Amazing Technicolor Dreamcoat hasn’t been posted? I mean, i’s the only piece of clothing that has an actual name.
Evita’s white dress (TOUCHDOWN!)
Cat outfits supposed to make people look like cats, but only make them look like people trying to look like cats (line stolen from Ed McBain’s mystery"There was a Little Girl").
The Starlight Express costumes, complete with roller skates.
The Phantom’s costume, complete with mask.
Carol Burnett’s curtain dress from “Went with the Wind”–I saw it in a window and just couldn’t resist.
Marilyn Monroe’s white dress, over the subway grate.
(GOOOOOOOOOOOOOOOOOAAAAAAAAAAAAAAAAAAAALLLLLLLLLLLLLLL!!!)
brightly-colored parachute pants–MC Hammer
Round wire-rimmed glasses: Harry Potter
White suit with black necktie: Mr. Roarke from Fantasy Island
White suit with black string tie: Colonel Sanders
Cane and running shoes: Dr. House
All black clothing and black sunglasses: Roy Orbison
All black clothing without sunglasses: Johnny Cash
Black leather jacket: Fonzie
Ratty bathrobe: Hawkeye Pierce
Hat with fishing lures: Col. Henry Blake
Horn-rimmed glasses with suit and skinny tie: Elvis Costello
Red tiered wedding cake hats and radiation suits: Devo
White button-down shirt and tan pants: The Professor
Blue polo shirt, tan pants, captain’s hat: The Skipper
Purple velvet tailcoat and green top hat: Willy Wonka
You didn’t bother reading the thread, did you?
Deleted after rereading the last two posts
Um…probably not as thoroughly as I should have. 
There’s actually a website devoted tto Big Bang Theory’s Sheldon Cooper’s T-shirts