You can of course make latex clothing in such a way that it does not come with a closure.
That is not always necessary, just think of a simple latex skirt or dress, that's how you step in.
But for a corset, or jeans and the like, you really need some extra materials to completely finish off the latex garment. Press buttons, nests and staples that you place with a pair of pincers, also called variotang. Of course you first have to make a hole with a hole punch, a gun.