Usually when a designer label hits Canal Street, it's because of a counterfeit. Not so with Alice Roi, the New York native whose collections have modest success in Bryant Park, Bloomingdale's, and Barney's. This month, the pretty-edgy designer launches her latest venture, a Canal Street pop-up store with designer Sarah Luna. Parked on the corner of Essex, the shop stocks Roi's usual hit list of lacy dresses, collared blouses, and a-line skirts. It's open through Saturday from 1-9 pm, which means after you pillage an embroidered cashmere sweater, you can walk to Joe's Shanghai for the best soup dumplings ever... but not too many, or Alice's body-hugging velvet clothes won't fit right.