No matter how often you change your style, one thing stays constant: You'll always need a steady supply of undies. That's why I love Club Fife, which is essentially a subscription service for underwear. Made in San Francisco by Scottish designer Andrew Linton, Fife's boy shorts and thongs (or "knickers," as they're known to Brits) are made of modal, a fabric made from beechwood chips. The knickers wear like silk or microfiber (read: no panty lines) but feel like cotton, and they're machine washable too. (I should also mention that I usually avoid thongs at all costs, and these are the most comfortable ones I've ever worn.)
As a Club Fife member, you pay $20 every month to have two pairs of thongs delivered to you by mail. Two pairs of boy shorts cost $24 per month, and a combo package containing one of each style goes for $22 a month. Also, if you sign up for a yearlong membership, you get two months free! And you'll never have to worry about going underwear shopping again.