For many of us, warmer weather means a switch to more casual outfits. We still want to look fashionable, though — and layering is one of the best ways to add style to any basic outfit, whatever the season. We're huge fans here of the classic women's denim jacket as an essential layering piece. Worn over a dress or shorts, a jean jacket can elevate your summer outfit, without sacrificing its easy, breezy vibe. On cool summer nights, a denim jacket also makes a great, cozy top layer, whether you're dressing for a date, or going out with girlfriends. Here are our favorite ways to wear a jean jacket this summer, inspired by street style fashion.