Oh bloody hell. Topshop.com just launched its Archive online -- amazing one-of-a-kind vintage pieces. The best ones, according to me:

(Apprx $507 USD, Lee Bender,
TopShop.com)
Amazing and gorgeous print.

($365, Lee Bender for Bus Stop,
Topshop.com)
Also amazing, but more akin to something you might find in your local (read: NOT NYC) thrift store.

(Approx $507 USD, Lee Bender,
Topshop.com)
Good luck finding this outstanding (yet offensive! -- bonus!) dress at your local thrift store.
More vintage-lookin' dresses:

($240, Castle Starr,
YLLI)
Stunning. Want.
This has a gorgeous 1960s, June Carter Cash feel to it.

($193, Cindy Lee,
RevolveClothing.com)
Also a great '60s-vibe.

($109, What Comes Around Goes Around,
YLLI)
I. Have. No. Words...

($184, Tibi,
Net-a-Porter)
I hollaed at this dress
last week...

($24.50,
Wet Seal)
... And Wet Seal hollaed back! Sweeet!
Finally...

($20, Cheap Monday,
Mick Margo via Refinery29)
Um, hi. Cheap Monday jeans for $20! More like Cheap Thursday! I'm off to get a pair!