That one's easy. He didn't have a chance to pack his bags before leaving Bespin. So, he had to raid Han's closet, since Han wasn't using his wardrobe at the time. I doubt he knew anyone else in the Rebellion well enough to ask to borrow their clothes.
Does anyone ever wonder if Lando checked the ships refresher when Han left for Endor? We all do remember that shower deleted scene in Solo...poor Lando (Those drinks aren't gonna wipe away the feeling of Wookie fur on the tile floor)
I really want to watch Solo again, but I'm currently watching ANH after Rogue One in my SW marathon before Andor S2, I guess Solo will be after the prequels...
SOLO after the prequels and before the Obiwan series, if you are including the series in your marathon. When SOLO came out it was a breathe of fresh air form me after the previous film which I hated, SOLO is definitely underrated. I enjoyed what they did with the Falcon. Lando spending a fortune to turn a tired old freighter into a luxurious cladded personal transport, only for Han to to wreck the ship to a condition that was worse than when Lando first acquired the ship.
Artoo and Threepio cleaned the Falcon before leaving for Endor, Artoo has a vacuum cleaner nozzle we just haven't seen yet. I shouldn't have ventured into these threads, now I'm going to have to watch Solo again.