〜枚
counter for flat things
一枚, 二枚, 三枚 … (まい)
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枚 counts flat, thin things: sheets of paper, tickets, photos, shirts, plates, stamps.
Unlike 本, it has no sound changes: いちまい, にまい, さんまい, よんまい, ごまい… and 何枚 is なんまい.
The choice of counter comes from the shape, not the category, so a shirt is 一枚 (it's flat when folded) while trousers are often 一本 (long). When you don't know the counter, つ is almost always understood, but the right counter sounds natural and is worth picking up as you go.
Examples
切符を二枚ください。
Two tickets, please.
紙を一枚ください。
Could I have a sheet of paper?
写真を五枚撮りました。
I took five photos.
シャツを三枚買いました。
I bought three shirts.
お皿は何枚いりますか。
How many plates do you need?