Should Motorcycle Jacket Fit Loose. I went to cycle gear today and picked up a dainese zen leather street jacket. A motorcycle jacket can only do its job if it can stay in place to protect you.
This is because most motorbike jackets have extra padding on the inside and need to be close to the body to work optimally. A jacket that is loose may not adequately protect you in the event of a fall. As you wear your helmet in, it should loosen up a little, but not to the point of moving from side to side easily.
The large fits great over a long sleeved tee shirt, but is snug with even a very light weight sweater, and without a sweater i think the jacket wouldn't be warm enough.
Most have straps to adjust fit for layers. That way if you get off before the ride stops you won't slide around inside the jacket as you slide down the road. Some riders prefer the motorcycle jacket fit to be loose, but the issue with a loose jacket is the air can flow up making you uncomfortable. A motorcycle jacket can only do its job if it can stay in place to protect you.