The boom in brand-designer collabs shows no signs of slowing, but often the brightest partnerships are buried beneath big box buzz. Last week, we clued you in to five fun new lines you likely hadn’t heard of, including Kate Spade for Keds and Jonathan Adler for TOMS. Today we’re back with four more fair weather gems. A design icon and a Billboard chart-topper highlight today’s list of limited editions, and that’s just the beginning. Read on for a fresh batch of under-the-radar collabs to spring your wardrobe forward! Vivienne Westwood – and the results are both whimsical and wearable. The range comprises tees, watches, shoes, bags, shades, and denim, from daily basics to statement pieces. Shown: Cateye Sunglasses ($241), Lime Michele Gladiator Flat Sandals ($486), and Adrian Duffle Bag ($272) Valentino stamp of approval. Our fave look from the Italian luxury house’s partnership with Brazil’s Havaianas puts a laid-back spin on the top-selling Rockstud heel. Shown: Limited Edition Camo Studded Sandals ($295) I Am Other collab with Japanese sportswear retailer Uniqlo. Tees and caps by the Billboard Producer of the Decade make fun and super-affordable gifts, available for both men and women. Shown: Women’s I Am Other Short Sleeve Graphic T-Shirt in Light Purple and Green (each $19.90) FEED has donated 60 million meals to needy children around the world through the sale of its unmistakable totes and pouches. Designed in partnership with blogger Joy Cho, a FEED diaper bag brings form and function to new moms, and provides a mother and child with micronutrient supplements for one year. We also love a bridal style for spring and summer weddings. Shown: FEED + Oh Joy! Diaper Bag ($150) and FEED Bridal Bag ($60) All images via individual retailers.