Designer collaborations may be increasingly common, but great ones remain few and far between. Click through for eleven that we’ll be shopping this fall. Shop fast: Some have already sold out once, and most aren’t likely to be back next season. [The Feast]

Dockers’ “GQ” Designer Series
When Dockers announced a capsule line with 2011’s CFDA menswear nominees, we assumed that the pieces would sell out on their Fashion’s Night Out debut. They didn’t. Score looks by menswear’s top talents — which range from Patrick Ervell mini pleated chinos ($200) to skinny carpenters by Alexander Wang ($200).

Hello Kitty x Forever 21
One might expect a team-up between Sanrio and the fast fashion retailer to be (literal) fashion fluff. Not so. The printed blouses, pink-trimmed navy cargigans, and varsity sweaters are entirely fashion forward and just campy enough for high fashion consumers to love — and wear — for seasons to come.

Versace x H&M
Leaked photos from Vogue Russia are currently making the rounds, but we’re betting that if you don’t stand in line for the November 19th select store launch, they’ll be all that you see of the fall collection. Good news, though: Donatella Versace is designing a pre-spring follow-up, which will be sold online and in-store on January 19, 2012.

Karen Elson x Nine West
The singer/model’s team-up with Nine West may not be the first of the label’s “Americana” celebrity designer series, but it’s certainly the gutsiest. Shop wine-colored worn leather platforms ($104) , witchy black boots ($174.50), and more online and at Nine West stores nationwide.

Alexa Chung x Madewell
The “it” girl designer’s September 23 fall collection launch may have crashed the site on day one (and this $155 gold lace top has sold out twice online since collection launch), but there’s still plenty of cool-girl casualwear to go around now that stocks have been replenished.

Giambattista Valli for Macy’s Impulse
We’ve previewed a good portion of the looks in person, but have yet to try the most buzzed about looks — these tapered tuxedo pants and this sweeping strapless gown — on for size. The collection drops Wednesday, October 26.

The Man Repeller x Dannijo
The capsule line “Mr. Dannijo” may feature a metal shirt collar ($158) and life-sized mustache necklace ($98), but it’s not menswear: It’s simply the Man Repeller’s initials crossed with the name of the line. (And really, we’d expect nothing less from bawdy fashion pro Leandra Medine.)

J+ for Uniqlo’s Final Season
Tailoring master Jil Sander thrilled fans with a first-ever collection for the Japanese fast fashioner in October 2009, and two years in is still celebrating praise for the luxe fabrics and expert tailoring that full-priced label fans covet. Shop fast: The latest collection will be their last.

Club Monaco x Dazed and Confused
We’re huge fans of the once-monochrome label’s bold ventures into color and cool kid stylings. (They’re launching spring products with menswear blog A Continuous Lean!) This season? They celebrate a Euro expansion with looks inspired by 1970s London.

Nicola Formichetti x Uniqlo’s Innovation Project
The Gaga-loved stylist and Uniqlo fashion director previewed looks during anexclusive New York Fashion Week pop-up. Score futuristic styles — including rip-open hoodies, iPad-concealing bubble coats, and wax-lined windbreakers — at the new global flagship, and (soon, we’re told) online.

Rachel Antonoff x Bass Shoes
The quirky-cool womenswear designer follows a handful of spring oxfords and bow-topped saddle shoes with a fall line full of cozy boots and loafers. (Shop them at Bloomingdale’s stores nationwide.) As for how to style them? Look no further than herfall 2011 lookbook, shot on a snow-covered mini horse farm in New Jersey.