Waaay back in the pilot; They've just picked up Neelix, who is enjoying a bath and learning about the replicator...
Neelix: The replicator, can it make me clothing?
Neelix: Maybe a uniform, like yours?
Tuvok: No. It most certainly will not.
He's got some pretty good lines all through the pilot. My favourite would be when he first meets Neelix in the transporter room. There's a brief look of jaw tightening then
"Perhaps you would care for a bath..."