For most of my spring, summer and early fall riding, I wear a mesh jacket that's large enough to put different levels of fleece under it. The inner rain part of the mesh cuts the wind and the fleece, worn under, can be removed when it gets warmer.
I have 2 different fleece. One heavy and one lighter.
High top Steel toe work boots, or you can pay for special riding boots at a preimum cost.
I would like a pair of high tech pants, but for now, I just wear jeans and when it gets colder, I use slip over wind breaker pants.
A pair of leather gloves for summer, and heaver pair for cooler riding.
Some of the newer mesh jackets have 3 layers. These are bulky but you would only need one jacket for 90 % of spring, summer, fall riding.
There's different combinations of features in jackets between the major Mfr's.
Take your time and try on as many different brands as you can before you purchase. Some shops will let you sit on your bike with the jacket on. You may be able to try it on the road if you have a good dealer.
In some jackets you can remove padding, some you can't.
Look for features like, how do cuffs strap up. Do the sleeves adjust.
Try removing and reinstalling the different layers. Some can be very frustrating to use, especially the 3 layer types.
Decide if/what you will be wearing under it before you pick a size.
I can use my mesh ( w/o liner ) up to 90 deg's if I'm moving. Sitting in traffic is another thing.
Every one has different levels of tolerance.
I recently tried on a mesh that had 2 levels of the outer mesh. ( Supposed to be better road rash resistance.) I wore it on a hot day, and found it was hotter than my existing one with only one layer of outer mesh. Must not have as much ability to pass air through it. Something else to consider.
In our local shops, they also carry off brands at a lower cost than major names. I've seen decent mesh jackets for around $100. You could pay as much as $250 for some of the name brands.
The one I've been wearing for a couple of years was $25 when the dealer got a large shipment and sold them at their open house. The jacket is cheap, but it has mesh, padding, and most of the features of higher prices ones.
2017 Yamaha XT250
1990 Honda NX250 (Green/White)
2011 Kawasaki KLR 650 (Orange & White )
My KLR Page..http://www.powers31.info/2011_KLR650.htm
Mod's to KLR:
Power socket, L.E.D. Battery Indicator, Camera bag holder
Custom Saddlebag frames .
Louder horns, Firstgear Onyx tail bag.
Custom Aluminum Skid Plate.
Cut down seat with Custom pad.
Go Pro Camera mount.