I think I got some of these when i played the first few hours, but since then i cant remember if i "Disassembled" them on accident. Do I get these goodies only one time, or can I start a new Campaign and receive them again ???

I cant even find the Black Unicorn in my inventory and I definitely do not remember getting rid of a Sword.

WOLF SCHOOL JACKET
GALAXY T-SHIRT
WOLF SCHOOL T-SHIRT
BLACK UNICORN

You can craft them. So even if you disassembled them you can create them again.

Can you? I don't have recipes for them, but I have recipes for upgraded versions, but they require base versions, which I don't have anymore

Yea when I looked through the crafting menu they are there to be crafted. I did have them equipped at the time though. So I don't know if that has something to do with it?

i belive i sold my witcher items, and i dont have any rare recipes, epic only. I need a rare item in order to create an epic version.