pretty sure they just make them. Hats are actually pretty easy to make. four panels, a bill. a note saying “don’t use for close-ups”
Especially if it doesn’t have to last more then a week.
They get them from the replicators
Costume department: 🙄
Hence the trouble.
This may be the only time we see the back of Nog or Rom’s heads. Most Ferengi, other than Quark, wear those head curtains. The behind-the-camera reason for those is it simplifies the makeup process if you can just hang a cloth over the back of the actor’s head instead of affixing a prosthetic. (The prosthetic would need to be custom fitted to the actor, too, and Rom and Nog are nominally guest characters.)
There’s a handful of examples in “The Magnificent Ferengi.”
Get enough of 'em in a room and it’ll happen.
Isn’t that Quark tho? The commenter above said he was the exception.
They’ve got buttheads
A Ferengi in need is a Ferengi indeed
