The Loch Buttondown by SIMONMILLER is the ultimate versatile piece, crafted from stretch cotton poplin with a cutout back and adjustable tie for fit flexibility. The Loch Buttondown by SIMONMILLER is the ultimate versatile piece, crafted from stretch cotton poplin with a cutout back and adjustable tie for fit flexibility. SIMONMILLER is a Los Angeles-based lifestyle brand encapsulating a playful take on classic luxury. Featuring ready-to-wear, footwear, bags, and jewelry, each piece epitomizes the vibrant and mod lifestyle of their CEO and Creative Director, Chelsea Hansford.