Stillwater Button Up Crop Top in Black. - size L (also in ) Stillwater Button Up Crop Top in Black. - size L (also in ) 100% viscose. Dry clean only. Elasticized neckline. Front button closure. STWA-WS110. WL3033. A California brand with its roots in the bohemian lifestyle, Stillwater, seeks to appeal to the cool girl in all of us. The lines director and fashion industry vet, Lisa Popp, injects elements of simplicity by utilizing a neutral palate in many of the brands designs to nod at a minimalist existence. Stillwater not only exercises mindfulness by way of design, but also through production through recycled materials and sustainable practices.