Personally I'm a big fan of Citymutt, they made this deer that looks pretty deerlike imo.
Plus3defense (now named Goldenmaw) made this one, it's also some of their older work so they may have improved since making it. (edit: I looked it up and that deer was from 2015)
And of course Beastcub makes amazing deer suits in a variety of styles, but it can be pretty difficult to get a commission from her.
I don't have experience commissioning any of these makers, just reccommending based on style, but you could probably find reviews online.