
Oof. What a card. Cripplingly over-specialized, and subpar soak and skill icons to boot. It is unlikely that you would seriously consider this card in a blind run of any campaign, and even on a re-run, you have so many more all-purpose options to deal with the enemies with parley actions.
...That being said, I am what you might call, a maniac who makes it his business to include EVERY card that exists in this game at least once in one deck or another, even the bad ones. And to my surprise, I have found a niche for Fine Clothes, in a Joe Diamond deck no less:
Astute players may realise where I'm coming from in volunterring Joe to include this sub-par card; it turns out that Fine Clothes synergises with exactly two cards in the game right now (as of The Search for Kadath): Persuasion and Interrogate. That's right, injecting parley actions into your deck provides insurance against the dead-draw nature of Fine Clothes in the wrong scenario, providing it with the opportunity to always be useful. Granted Persuasion and Interrogate aren't exactly great cards either, but their badness comes from a hard test to pass, rather than a mediocre effect. In that regard, Fine Clothes elevates them to a decent level of power, and Joe Diamond fits the bill for this combo, due to having both the ability to take both and cards, and a hefty 4 in both attributes, which combined with the reduction of difficulty that Fine Clothes provides, all but ensures the success of the parley tests.
That's not to say this is a good combo by any means. It is however a thought experiment in how to maximise the potential of Fine Clothes, and I don't think it gets better than that for our tuxedo wearing mannequin... save for one last possible combo; Adaptable. With Adaptable, and proper knowledge of the scenarios that you'll be facing, you can elect to include Fine Clothes on the missions where it's actually useful, and swap them out when they won't be. This absolves them of their downside of ultra-specialisation, and a -2 difficulty on tests that may be a major part of a mission can turn a scenario one difficulty down for all intents and purposes. As to which ones you should consider swapping in Fine Clothes for, that would be spoilers, so I leave it to you to imagine when dressing in your Sunday's best would be appropiate.