As the title says, I cannot seem to find a preview in the tailor for Ferengi outfits -- nor in the Foundry, I might add.
Is there any way to preview how these new outfits look on a character without first having to buy them?

Not sure about how they look on a character, but in the store if you right click *I think* they show a picture of the actual piece.

Did so for the earrings and the KDF skirt *not on a character though* Didn't see the jacket at all.

I know about the right-click preview, I would like an On-Character preview - everyone can agree that would be much, much better.

The winter scarves worked the same way, they didn't appear in the tailor until you purchased them. I think they just did it that way because the costume pieces were limited time items.