great suggestions! I like your towel system emmarose...was trying to decide how many spare sets I would need and a good system to use so that tip really helps.....it is my first year to start playing a ton in the winter, but I have tons of snow and extreme rain backpacking and mountain biking experience.....
I use a Marmot precip for many acitivities paired with rei goretex pants, but with my unusual body type(6 foot 4 and fairly skinny) the xl jacket size that fits my arms is a little too bulky in the chest and stomach and tends to get in the way for me for some more active pursuits, even though it is an awesome rain shell for snowboarding, snow camping with lots of layers, and also a great value for the quality in my experience....
I have gravitated to higher end bicycling oriented rain gear due to a really streamlined cut in the model I found (size L, arms are a bit short)....made by performance bikes and a great value therefore, pretty sure it is just called the "Commuter" jacket and pants, they have sweet illuminite panels too which are hardly useful for disc but great for the bike ride home or not getting hit in the parking lot at dusk! haha!
I agree with most people about shoes, would like to add from many, many years of wet hiking that the best route i have found sock-wise is wool socks paired with a pair of ultra thin polypro liner socks, I use wigwam gobi, i think, for liners...I have guaranteed many peeps enhanced comfort and a complete lack of blisters with this dual sock setup and had many satisfied guarantee-ees

Considered trying waterproof socks but have read so many horrible reviews of these I think I will just keep lots of spare socks and use goretex lined shoes...for me my feet are usually way too hot in goretex lined shoes but with disc golf movement is minimal so these will probably work best I am thinking....
I plan to bring rain gear and a large umbrella this year, but avoid wearing the rain gear at all costs so as not to hamper my throws...I wear shorts whenever possible and just focus on keeping the core dry except in dangerously cold scenarios (which rarely occur in oregon in the valleys for me, but keep in mind i am known for running exceptionally warm body temp wise)....for the upper I love a fleece vest, arm warmers and a synthetic shirt of some kind....also my mountain hardwear windshirt is a great addition and is amazingly packable and awesome for light rain, mobility, and a great warming layer.