Где такую купить?

https://t-shirt.vviplike.com/mens-collarless-button-down-shirts-TT203269.html

https://superfashiondresses.blogspot.ru/2015/12/dress-shirts-with-no-collar.html

С белой окантовкой есть на Алибаба.
ht tps://russian.alibaba.com/product-detail/mens-french-cuff-dress-shirts-no-collar-dress-shirt-fabric-1982032572.html
ht tps://spanish.alibaba.com/product-detail/mens-french-cuff-dress-shirts-no-collar-dress-shirt-fabric-1982032572.html