Icchi lives here, so obviously he is there at the start of the party, greeting guests, directing them to leave gifts at the gift table, and pointing them towards food and drinks, telling them to make themselves at home. He is very proud of his costume, though the wig is a little large somehow and keeps slipping despite his best efforts to pin it. At some point later in the evening, he abandoned it...and then various other pieces of the outfit until it was basically just a slip, skirt, and stockings. And then just a slip and skirt. If nothing else, he respects wearers of women's clothing, because it might look good, but it isn't very comfortable.
I think normally he wouldn't allow shoes on indoors, because it would be too weird to him, but it is a Western-style apartment, so just this once, though he is going to ask the maid to mop everything this week.