What you need to know this instant.

Around the Web: eBay To Offer Designer Flash Sales

Sienna Miller starred in a short film to promote the clothing line she designs with her sister, Twenty8Twelve. Here, images of their texture-filled fall collection from London Fashion Week. [The Telegraph]

Wardrobe-essentials brand Theory relaunched its site--and it's e-commerce! [Racked]

eBay is launching new shopping formats this spring. The auction site will offer short-term designer sample sales (think: Gilt Groupe, Rue La La, etc.) in March and an online outlet mall (for stores such as Lord & Taylor and Brooks Brothers) in April. [WWD]

Although Alice by Alice Temperley isn't available in stores quite yet, it's available online. [The Thread]

Designer Mark Fast causes a stir with size 14 runway models at his London show. [My Fashion Life]

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