Should accents be used in French words when used in English? [duplicate]

I would say that my answer about when to italicize loaned words and phrases is also the most appropriate answer to this question:

I think this is a case where authors can decide for themselves where to draw the line. Or, if the writing is for a certain publication, the editors will have a policy for whether a given word should or should not [have diacritics].

(However, that answer got zero votes, so who knows? I still think it is a good answer.)

Various publications will have strict rules about what diacritics are used and when. For example, The New Yorker always uses diaeresis. Each publication seems to have its own rules for bolding, headers, section numbering, hyphenation, capitalization, reference citation, and so on. And there is no definitive format.

I believe that diacritics fall into this category, as evidenced by their generally inconsistent use (though internally consistent within many publications).

In general, if it's worthy of italics, it's worthy of diacritics (and vice versa). (Note that I left "vice versa" unitalicised. It's as English as spotted dick these days, even if it comes to us unmodified from elsewhere.)

I think it's likely time to stop pretending that "a la carte" has not been completely incorporated into the English lexicon. Once it makes it into the greasy spoon, it's not French cuisine anymore -- it's just a somewhat less unfriendly way of saying, "that costs extra, Mac." You might want to keep it italicised when referring to a list of alternates on a fine dining menu.

My rule of thumb is that if I can imagine it being used anywhere that beer is going to be served more often than Chablis, it's safe to treat it as English unless there is a style guide in effect dictating otherwise. If you are writing for publication, there is usually a house style guide to follow with a list of words that are not yet sufficiently English. If you find façade there, then you might as well keep the ol' character map open at all times.