X Karla - Update key basics with this white cotton-jersey The Classic T-shirt from Karla Welch's collaboration with Hanes. The stylist-turned-designer drew inspiration from 1990s shapes – prompted by a request for long-line tops from Justin Bieber when she was creating his tour wardrobe. It's crafted in the USA with a ribbed-knit neckline and slight slits at either side of the subtle step hem.