מה זה difference בין "בלי" ובין "בלעד"?
Technically, בלעדי would work too, it means the same thing as בלי. But I hardly ever use בלעדי or hear it used unless with a pronoun: לכו בלעדי. נעשה את זה בלעדיה. etc.
What's more, I have never heard בלעדי used except for a person. בלי can be used for people or things, but בלעדי is only used for people.
AFAICT this is not in any dictionary, but you won't find any sentence with בלעדי חולצה
Whatever, I NEED more sound tracks in this language to confirm my knowledge!!!please
Does Hebrew have a -less suffix? Or is it the same for "shirtless" and "without a shirt"?
No suffix. You need one of the words ללא or בלי.
is the indefinit article necessary in english, can i say 'without shirt'?
No you can't. The correct English is "without a shirt".
Whats the difference between בלי and אין
I would say אין is he doesn't have a shirt to wear as opposed to בלי, he just isn't wearing a shirt.