Sheena Yaitanes, the founder of Kosas, shares her laidback method for controlling the chaos (no prior Kondo experience required). When it comes to organizing, everyone has a system — or lack thereof. Sheena Yaitanes, the founder of the Los Angeles-based clean makeup brand Kosas, is surrounded by palettes and stacks of products all day. Her 1920s-era home doubles as her workspace, testing lab and sometimes warehouse. “It’s filled with beauty products of all kinds that are in various stages of…