In case you're looking for English, I agree with Amy that the words to avoid in a men's shirt if you don't have a narrow waist are tapered, fitted, slim, etc. (Or, here, European cut. (-: )
A word to look for for comfort in other articles of clothing, like women's pants, might be relaxed, but I'm not aware that men's shirts come in relaxed cuts, only in big and tall, which has long arms as well as more fabric at the bottom. And even with women's pants, they now may have spandex instead of extra fabric, which isn't quite the same thing.
Which one is standard, classic, regular, etc. may depend on where you shop. I would assume that those are usually the looser-fitting ones, but in a brand that thinks of itself as higher-fashion, or indeed, in Europe, narrower cuts could be the standard/default.