He's still going to have difficulty directly asking for more than Viktor's "forcing" on him. If Viktor doesn't pick him out other outfits, they're just leaving with the one and the suit. Just holding open the door to that is as far as he can go. But if Viktor does decide to pick him out some other things that fall into that more casual aesthetic? He'll find that Yuuri will stand by quietly and let him buy most of the store, so long as it fits into that category.

It probably doesn't help anything right now that Yuuri's going swiftly from relaxed to almost dazed with the touches, another layer of permissiveness that Viktor knows from experience isn't at all at odds with him being more dominant, whatever it might look like to someone else. Yuuri letting him see him like this, get him like this, is a gift, some kind of reward. In this case, likely a thank you for making sure that he's comfortable here, for keeping the salespeople away so they have the privacy for this.

He still finds it a little difficult to look at his own body in the mirror, but all that means is that he's left staring intently at Viktor's face, into his eyes when they meet, with a singular kind of focus that's completely at odds with how indulgently relaxed he seems under Viktor's hands. It's the start of a promise that all of this is definitely going to end up back in Viktor's apartment, in their bed.