Shopping Events in New York, Starting April 25 Call it the week of unlikely friendships. Fashion's arch conceptualist Hussein Chalayan is collaborating on a capsule collection of good old-fashioned denim with Mavi Jeans. Of course, not everything is basic blue in the Mavi-Chalayan collaboration: the 15 styles include dark wash skinnies with a high-shine metallic band snaking from waist to heel ($200). At Brooklyn Industries, 290 Lafayette Street, brooklynindustries.com Maison Ladurée, meanwhile, has teamed up with Uniqlo on Les Amis de Ladurée graphic tees. Almost as delectable as the new melon and strawberry mint-flavored macarons at the Madison Avenue patisserie, the tops ($19.90) benefit a Japanese children's charity - and have zero calories. How sweet is that? At Uniqlo, 666 Fifth Avenue; uniqlo.com. Openings Whether you're looking for a pilot bag ($725) or a just a cup of joe ($2.35), the Rag & Bone General Store has your bases covered. The meatpacking-district shop (on the ground floor of the onetime veal factory that houses the label's corporate headquarters) has a coffee bar with Jack's Stir Brew coffee and a rotating display of art from local galleries. Matthew Albanese's landscape simulacra on loan from the Garis & Hahn gallery are now featured along with the Rag & Bone spring collection. At 425 West 13th Street, (212) 249-3331. Sales and Events Print lovers are in luck, as the sample sale lineup for the coming days includes both Proenza Schouler and Thakoon. First up, items from Jack McCollough and Lazaro Hernandez's fall collection, like a brocade minidress ($895), are up to 75 percent off Friday and Saturday at 76 Mercer Street. Starting Tuesday, Thakoon Panichgul's designs from the 2012 preseason and runway collections - an ikat silk jumpsuit ($150), for instance - are up to 85 percent off at 225 Varick, Suite 300. ... On Thursday evening, designers including Narciso Rodriguez, Alejandro Ingelmo and Lela Rose will be at Bloomingdale's from 6 to 8 p.m. to help raise money for Parsons Scholars, a program for underprivileged New York City high school students. Ten percent of proceeds at the shopping event will benefit the organization. At 1000 Third Avenue, fourth floor. The Saks Fifth Avenue Friends & Family sale continues through Sunday with discounts up to 25 percent in stores and online. Use the code FRNFAM2 for e-commerce purchases. And on Monday, the Costume National designer Ennio Capasa will be at Saks for a preview of his spring collection with a live performance by Sophie Auster. Ten percent of sales from 6:30 to 8:30 p.m. will benefit OrphanAid Africa. At 611 Fifth Avenue; saksfifthavenue.com. Send shopping suggestions to