Normally, I find in first PoV that as the others have said, they aren't needed. The writer usually fills all that in. On occasion, another character may make some comment about how the mc looks.
But! I just started a book* in first PoV and the way the author 'told' me how the character looks was clever (for me, at any rate) and it felt very much like a poke in the eye to the editor that may have told him 'we need a character description'.
The author started us off in the story with the mc's partner getting killed and him, heroically, getting out of it alive only to mourn her death. He mourned, gave us a bit of insight into his character and how he came to be an Inquisitor** and his general mind set. After a rundown of his qualities and reminds you of his excellent skill with a blade (he is a bit arrogant), he finishes off with "My eyes are dark, my hair darker and thick. These things matter little. Come and let me show you how I killed [the main antagonist]."
Yeah...pretty much a 'look in the mirror and tell us what you see' but I don't know. Like I said, it came off as reading that the author was told to put it in and he did, with a firm poke. It worked for me, I'm already in love with this character and I love this author for it very much.
* A caveat here is that it's a novel written for a RPG universe, so, as in many romances having 'the formula' that editors like authors to use, I suspect these kinds of novels also have a formula that requires some sort of description of the character.
** I'm a shameless h0r for Inquisitor characters. *sighs happily*