What does Garments of the Moon reward?

Garments of the Moon gives Moon Robes of Elune outright.

Where does Garments of the Moon start?

It was picked up in Teldrassil.

Its level has not been recorded yet; it shows once a player accepts it with the addon running.

No. The quest exists in Classic Era as well.

World of Warcraft: Forever · quest

A quest in World of Warcraft: Forever in Teldrassil. Recorded by 1 player running the addon.

Level, giver, pay and objectives show once a player with the addon accepts the quest.

Item	Given	Item level	Vendor sell
Moon Robes of Elune	outright	10	17c

What does Garments of the Moon reward?: Garments of the Moon gives Moon Robes of Elune outright.
Where does Garments of the Moon start?: It was picked up in Teldrassil.
What level is Garments of the Moon?: Its level has not been recorded yet; it shows once a player accepts it with the addon running.
Is Garments of the Moon new in WoW Forever?: No. The quest exists in Classic Era as well.

Source: what players running the addon saw in the quest windows; the quest text itself stays in the game. Every quest seen · Teldrassil