Learn English – to wear a jeans / jeans / a pair of jeans? which one is right

The expression to dawn on [someone] does convey the right meaning in your sentence, but it isn't very idiomatic in this case. I think comes to mind would flow off the tongue more easily, or perhaps that I can think of.

Also expressions to say that isn't quite correct. You can say there are many ways to say that or there are many expressions that mean that, but an expression can't say anything, so you don't mix the two.

The last part of your sentence is very confusing. I think I know what you mean, but it's very awkwardly written. I'll try to rewrite it for you in a way I think is idiomatic for native speakers, and if I've got the meaning wrong you can let me know and I'll rewrite it.

Perhaps there are many other ways to say that in your mother tongue, but this is the only one I can think of that conveys my meaning.

Here conveys my meaning means that gets my meaning across to you correctly. I think this is what you were trying to get at in the last part of your sentence.

The meaning of "dress" is context-sensitive.

In "Nice dress, man!", the "nice" modifier makes it sound like you are referring to a specific item of clothing that you like. Therefore, I would assume that you are referring to a skirt-like garment. The same goes for "a dress", "the dress", "this dress", "your dress", or any modifier that makes it sound specific.

There are, however, situations where "dress" has a more generic meaning:

• "Dress" used as an adjective is likely to be generic:

  This company has a strict dress code: suits and ties for men, pantsuits for women.

• "Dress" used as a verb is likely to be generic:

  This party will be an opportunity to dress up.

  It's taking you forever to get dressed!

• "Dress" used as a noun requires thought:

  The wedding invitation says formal dress requested, so I'll have to get my old suit altered.