This is how I figure the rest of it goes down. It basically turns into a game of telephone in Avengers Tower.
Bucky goes to Nat to show her how excited he is that his arm won’t be seen because he’s genuinely psyched. That makes Natasha believe this is about hiding scars, a goal she can support, and she pulls out of a drawer This carefully designed bikini. It hides her gut shot perfectly
Clint sees what she’s going to be wearing while trying to find the jacket he was sent to retrieve, and assumes he’s supposed to match Natasha’s style. He wears This.
Steve hears from Clint that swimsuits are agender now, and everyone wears things like that. Steve is in awe of the modern world, but wants something classic. Doesn’t want to be a tart. He goes with This.
Tony gets an alert about the deliveries, and takes this to mean they’re going all in, and it’s time to find the worst swimsuit he can. He considers the thongs he wore in his twenties, but found a picture from when he was seven, and changes his mind. He has This custom sewn in his size.
Bruce gets on a plane to avoid any part of this, but warns Sam on his way out the door. Sam knows he’s gorgeous, and wears what he wants, but tries to stay with the theme. No one argue with him wearing This.
Thor only gets told that they’re going to the beach. No one thinks through what they forgot to mention. Thor purchases nothing. When they arrive, Thor strips off everything and runs for the waves.
The photos from that day break the internet. For a solid week.
And in the background of almost all of them is Bucky.
Who builds sandcastles the entire day.