Forever 21 Heatwave Collection / Lookbook. Forever 21 is bringing on the heatwave with their latest collection for summer 2012. The new exclusive design collection from the brand consists of everything fashionable you’ll need for this summer. From soft looks of pastels, to bold hues of neon, sheer materials, stripes, and even a few halter tops that leave little to the imagination. The collection even features some high-low styles and high waisted shorts for the true fashionista. Look below to get a glimpse of the collection through the lookbook. Now available in stores.