Although the vast majority of gothic-style shirts are black, white shirts can work too if combined with a black coat and pants. Some Goth shirts are in a style that could be called pirate-like, with fancy collars and sleeves, while other fit close to the body, and often feature one or two rows of metallic buttons. More complex versions could feature belt-like fasteners, chains or rips. Sleeves are almost always long, even overly so, so that they can cover part of the hands.
Two examples – I like the multiple buttons on the version on the right:
Gothic shirts for men pictured:
Left: DangerousFX Men’s Pirate Shirt Gothic Steam Punk LARP Fancy-Dress. Sizes L-4XL
Right: Necessary Evil Chronus Shirt