There’s no such thing as bad weather, only bad clothing. That saying is rarely more true than when you’re coxing in the rain – waterproof gear is a must, as is a hat and water-resistant/proof gloves, especially if it’s already cold out.
Even if I’ve got a survival suit on hand I still layer up with my rain jacket and pants underneath because those suits have a tendency to leak, especially if they’re old. There’s nothing worse than realizing midway through practice that your butt is soaking wet because the water that’s unknowingly been gathering in the coxswain’s seat has finally seeped through your suit.
If it’s warm out (like, mid-60s+) then I’ll usually forgo the majority of the layers and just put my rain gear on over a tshirt, leggings, and pair of sandals. Basically just use your common sense when it comes to dressing for the temperature, throw on some waterproof layers over that, and you should be all good.