Steve
The bracelets had the date you two met engraved into them.
Tony
Tony bought them, he loves to match & says you look stunning in a cap.
Loki
You wanted something cute but not super noticeable because you knew Loki wouldn't wear it otherwise.
Bucky
(You decide who wears which one) He thought they were cute & funny, you wear it because it's so comfy.
Peter
He took you to Disneyland & you decided to buy these!
Thor