I have the orange/gray one too. I’m 5’3” 127 lbs and bought size large because I like a loose fit. Nice pockets and good that it goes higher on my neck. Very reflective. It’s not a thin vest, which I like; perfect to run with temps in 40’s.
Bought for my daughter for visibility on dark runs. Pluses: two side zipper pockets, rear pocket, sizing looks great, fabric is incredibly reflective. I wish the pocket on the back was deeper - I'm afraid things like hats might fall out of it. Very pleased with this purchase.