There's a couple coat patterns in Simplicity's Men's section
that could work, but they'd all need heavy modification for the collar and opening. Also looks like you'd want to put in shoulder pads, which I've never done but I'm assuming also requires some pattern tweaking. I feel like a closer pattern would be more readily available in Women's but I'm not familiar with fitting women's patterns to men or vice versa so I'm not sure if that should even be recommended.
I will say I'd make the sash separate. There's nothing that says to me it's supposed to be attached to the coat from that gif, and it'll make it easier to make and wear. I'd think just some heavy interfacing with like a snap or something in the armpit could work, or maybe some millinery stuff.