i recently purchased an Altura pocket rocket pac away waterproof jkt. It's very lightweight. When i'm wearing it, the material blows up at the shoulders and i can't see anything other than jacket when i look over my shoulder. however it also rides up at the back a bit so it's not keeping my bum dry. There is a bit of space between the neckline of the jacket and my neck. Have i made an expensive mistake and bought my jacket a bit to big? Or is it just because i bought a mans jkt and not a ladies one? I'd be grateful for any advice.