A/N: Some of these will have pictures and some won't.
...Clint Barton/ Hawkeye
Him:
This, plus a t-shirt
You:
A pair of panties and one of his plaid shirts.
...Tony Stark/ Iron Man
Him:
He loves the way the fabric feels against his skin
You:
Tony loved it whenever you wore this to bed. He could barely keep his hands off you.
..Pietro Maximoff/ Quick Silver
You and Pietro both sleep naked.
...Thor Odinson
Him:
It would depend on whether he was in Asgard or not. If in Midgard, he'd wear Midgardian pyjamas. If was in Asgard, he'd wear Asgardian ones.