Marc Jacobs is on an impromptu search to fill the shoes of its resident Tweeter/social media minion. The brand sent out a series of messages asking followers to strut their virtual stuff in 140 characters or less. No résumés. No cover letters. No mission statements. Just clever personalities. They’ve been travelling around the world along with the fashion weeks to do impromptu store interviews, too. Get in on the action at twitter.com/MarcJacobsIntl

London-based knitwear aficionado — and fellow Canadian — Mark Fast has teamed up with leather retailer Danier to create looks for his Fall/Winter 2011 collection debuting during London Fashion Week. Fast is known for his crochet-knit — and deliciously revealing — dresses (Rihanna sported one on a W cover last year), and previously introduced Swarovski crystal elements in his Spring line. A first for both brands, look for a capsule collection inspired by Fast’s collection to hit stores this fall.