Is it correct in English if i say ?

In most situations it's inappropriate.

It's correct, but it's not a good analogy. While a bra (usually) covers the breasts, covering isn't its purpose. It's designed to support.

No. the word 'i' should be a capital letter.
'Wanna' is not an English word. The correct words would be 'want to'.
There should be a full stop (a 'Point' in some countries) after the word 'breasts'.