The Modern Denim Shirt Thomas Mason The Denim Shirt The Best Denim Shirts, According to Fashion Editors Who What Wear Mid Blue Denim Shirt Eton. The perfect denim shirt does exist. Now in several colors from light to dark and in our softest washed denim from our factory in Portugal. The Denim Shirt fits slim. Rochelle Behrens reimagined how shirts should fit and feel. Our patented No Gape button technology, seamlessly designed into every shirt and shirtdress we design, eliminates blouse gape. Finally say bye bye blouse gape, hello The Shirt. Made in Portugal 100% Cotton Powered by No Gape button technology