Besides the Tag scene, was the space outfit ever seen during an episode?

Mork's spacesuit was seen in several episodes, although not always when he was wearing it - sometimes he would talk to it (yes it talked back - Ken Greenwald is credited as the voice) there was even an episode where the suit was lonely and misbehaving.

that I can think of without rewatching episodes, the suit appeared in:

2. Mork & Mindy Pilot part2 (when he appeared to Fonzie he was wearing it)
5. Mork in Love (he talks to the suit)
7. Mork Goes Public (Mork wears the suit in an attempt to win reward money from a newspaper for finding an alien)
16. Young Love (as captain of a spaceship, Mork performs a wedding ceremony)
23. Mork Runs Down (not sure of this one, but I think he wore the suit for his birthday party)

37. Mork vs. the Necrotons Part 2 (when Mork goes to Racquel Welch's ship)

i'm sure there were a lot more, the suit is seen many more times just hanging in its closet as well...