"Tch, don't... don't complain when your clothes are ruined by the swamp muck."
When all your clothes are expensive and you have to get through an Underdark swamp, embarrassing compromises might have to be made, and Quill intends to look presentable when they get to the Duergar city.
But this is Dungeons and Dragons and it's risky to stow your weapons, even if you're armed like it's a first person shooter.