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One of the challenges of shopping online is visualizing how you'd wear an item without being able to try it on in person. That's why we love Nasty Gal, StyleList's Online Boutique of the Week. Not only are the site's edgy offerings expertly styled, the staff also shoots magazine-esque look books, helping you figure out how different pieces fit together.

But the best feature is the items themselves, a mix of on-trend vintage pieces and hip, affordable casualwear with an Urban Outfitters vibe. Think studded Sam Edelman pumps, asymmetrical, leather-trimmed skirts and slouchy maxidresses.

Home Base: San Francisco

Prices: Affordable. Most spring-summer dresses are less than $100 with the exception of designer vintage pieces, which top out around $250.

Returns: Full refunds, minus postage, for most unworn, unaltered merchandise within 30 days.

Shipping: Shipping costs vary but start at $6 for five-to-seven-day priority mail.