Designer Simone Rocha, right, with musician Grian Chatten, who wears a trench coat, T-shirt, pants and shoes from Rocha’s inaugural menswear collection. Simone Rocha trench coat, $2,780, T-shirt, $385, pants, $970, and shoes, $900, SimoneRocha​.com. To Simone Rocha the standout item in her recently launched menswear collection isn’t one of her balloon-sleeved bomber jackets or tricksy zip-front trousers—it’s the oh-so-elemental white cotton dress shirt. “Something like the pure cotton shirt, I think, is such a beautiful starting point” for the collection, says Rocha, 36, an Irish-born fashion designer based in London. “I love going to something that’s really pure.”

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