Originally Posted by HankY
... Thought it was a good question to bring up being that I live in Michigan and it will be snowing soon !
I like your thinking!
Well, here are some suggestions from climate more similar to yours (with a friendly wave to all Arizonians, Texans, etc.).
In warm weather, I use summer riding gear from Rev'It. I am not sure if one can call it "mesh", because the fabric has barely any openings - but is permeable. The pants and jacket I have also come with wind liners, which are great when the temps drop out of the hot range. Remember that beyond a few very hot weeks mid-summer, you will often encounter hot days and cool mornings/evenings.
Generally, I use my summer riding gear in temperatures from the 60's up. Wearing raingear over summer suit extends the temperature range even further down.
Unless it is very, very hot, I use long-sleeve lycra-like base layer. Typically, UnderArmor on top and Alpinestars Tech Underwear on bottom. It's counter-intuitive, but it allows the suit to slide against the skin - otherwise it would get horribly stuck and uncomfortable. That's an old trick from wearing full race leathers. Few things are as uncomfortable as race leathers on a hot day, stuck to your body.
I do use a full-face helmet. In the summer, the visor is cracked open more than I'd like, but - hey - I need to breathe. Under the helmet, I use one of these fabric Buff Headwear "tubes" pulled over my head like a balaclava (google that). The fabric is thin and absorbs sweat, reducing the" stinkiness" of the helmet itself. It also eases slipping in and out of the helmet when you are all hot and bothered...
Make sure to use a short windscreen to allow you some airflow. Tall screens are great when it is cooler, but create too much still hot air in the summer.
This is my summer getup. I just realized that it is about 5-6 years old; I guess I should not be too annoyed that it starts showing some wear...
In New Jersey heat:
In South Africa:
Enjoy! The riding season will be back soon enough.