There are some things we just can't give up despite the season — leather being high up on the "please never leave our closet" list. Real or faux, a well-executed leather top or pleated skirt can instantly transform your look from subdued to slick and sophisticated. Look to our stylish A-list set for Summer-minded proof that this staple can be worn in much warmer temps. Ashlee Simpson offset her fiery red leather Alice + Olivia shorts with a semisheer blouse, Olivia Palermo put a refined spin on the luxe material via a black Christian Dior peplum top and navy skirt, and Jessica Biel showed off the perfect way to wear your white pencil skirt to the office. No need to rework your leather pieces; we've got seven days' worth of star-studded styling inspiration to get you through your nine-to-five and right into Saturday night's festivities.