Re: cufflinks and french cuffs I see it commonly among lobbyists in DC and partners at big firms
This ^^ seems to be common in many professions in the US, where french cuffs are considered to be reserved for senior staff. If this is the case in law firms and you are interviewing for a junior position, you run the risk of looking like you have an inflated sense of your own importance. I think conservatism is fine for a law interview, but pretentiousness, not so much.
I know my view will take flak from some on the forum, but it will mostly be from people who have never worked in an environment like a law firm. If you actually want the job and its for an entry level or other junior role, I would avoid french cuffs. If it’s a moderately senior role, then you should be fine.
Of course, once you have the job, have a feel for the firm and have seen what is commonly worn there by your peers, then you can push the style boundaries a bit further.