Is "be wearing" improper English?

If I were to say,

Can't I just be wearing my swim suit already?

Would "be wearing" be improper English?

Solution 1:

Your sentence makes perfect sense in this context:

Parent: You need to wear something warm, and find someplace to change into your swimsuit.

Child: If I wear other clothes over it, can't I just be wearing my swim suit already? That way I won't have to find a changing room.

Solution 2:

"be wearing" is fine in certain uses:

I will be wearing a swim suit.

Will I just be wearing my swim suit?

I don't really understand your example sentence, however, so it strikes me as incorrect. Perhaps one of these will work better:

Why am I not wearing my swim suit already?

Can't I just wear my swim suit?

Am I not already wearing my swim suit?

"Already" seems slightly out of place as well but I can see how it would work with the right context:

Ugh, stop messing with my swim suit. Can't I just wear it already?

Solution 3:

Maybe your example sentence would work if you were indicating that you want your character in, say, a novel to "be wearing" a swimsuit in a certain scene:

You: Can't I just be wearing my swim suit already? My character is just about to go to the beach.

Author of the novel: No, your character has to look as unattractive as possible up until the beach scene. She can change in a bathroom there.