Thor had been looking forward to meeting Peggy for tea for quite some time. In part because he always liked to try new things, but mostly because he felt that he could use more friends. Darcy was one of the few people that he spoke to on a regular basis and while Tony liked to tease him on the network, they weren't exactly close.
Dressed down in mortal attire (which consisted of sneakers, dark blue jeans and a light blue tee) he approached Peggy's door and hesitated (he didn't want to pound the door down) before lightly rapping on the door.