I have to say, I ordered the hoodie a size bigger than I needed to wear over leathers, but I think the cuffs might be a tad restrictive, they are quite narrow. Also the hood hides the design at the back, so maybe it's worth looking into a zipper or fleece type top? Just a thought.
I haven't tried the fleece over leathers yet (cos I havent bought my leathers yet!) so maybe someone who has can advise.
I'm still chuffed to bits with mine.