I feel that onlookers/non cyclist often underestimate how hard cycling is. They see legs spinning assuming we're just doing beach cruiser efforts. Us riders know how much suffering even a little elevation can bring.
I'm 5'6 170lbs and the medium is a "club fit" just the way I like my hoodies. Not a tight "race fit" or too baggy. This hoodie is a nod to those in the know. Suffer on! IYKYK.