The making of clothing is tied to the Common skill, which causes the maximum quality to be Decent.
If you were to change it to another skill it might be possible, but I haven't tried.
Note that the stuff your character whips together in a couple of hours is nowhere the quality a tailor might produce over a significantly longer time (and the game currently doesn't support such long tasks, except the few that can be interrupted and resumed), which I believe is the role playing reason for the quality cap.