If you still haven't embraced the miracle of online shopping, we’re pretty sure you’ll change your mind after visiting Asos. The web-based shopping mecca has a comprehensive range of pretty much everything fashion-related you can think of. As well as stocking its own Asos brand, you can search through hundreds of other high-street labels for everything from casual separates to accessories and eveningwear. Its swimwear collection is extensive (some 50-plus pages), with a mix of pretty polkadot bikinis, bandeaus, fashionable one-pieces, and the all-important mix-and-match tops and bottoms. You’ll find exactly what you’re looking for—and did we mention that delivery is free?