There are no all-weather outfits. You need multiple layers. Some breathable, sweat absorbing shirts (Merino or some fancypants fabric), a fleece for warmth, a softshell, and rain gear.
This sort of surprised me. I know for motorcyclists they make all sorts of all-weather quasi-waterproof gear. I suppose the differences is that most of the motorcycle gear might be difficult to peddle a bike in.
Because you're exerting yourself while biking, there's a need for breathability. You will easily out sweat any Gore-Tex/Polartec/Schoeller wunderfabrik if riding for more than 10 minutes. In addition, there's a need for mobility since your legs are always moving.
The raincape/poncho, however dorky people may view it, is actually one of the more effective wet weather items provided it's not too windy.
I don't sweat through my Outlier SDs (Schoeller IIRC). My Veilance shell (GTX Pro I think) is also okay if it's super cold, but would rather just get wet in the summer.
My point was moreso that any sort of rainproof gear will eventually cause you to sweat due to decreased venting, and it's about finding the balance between sweating, or getting rained on. Everyone's mileage will obivously differ given different bodies, air humidities, and length of commute.
The difference is that waste heat from the engine appears outside of the clothes of our noise-propelled friends, whereas we cyclists have to carefully balance between isolation and cooling. If the route is hilly, you would actually want (but don't have) completely different sets of clothing for going up vs going down, on the same ride in the same weather conditions.
