Perfect shell - Mammut Mittellegi Pro HS Hooded Jacket - Mens

Jacket was delivered in 10 days. Every detail about this jacket is just perfect. I love the hood and how every part of it can be adjusted. Best hard shell jacket I've ever had. Still haven't tried it, but hopefully it will serve me well on my upcoming Annapurna Base Camp trek. The only think that I'm still not sure about is size of the jacket. I ordered size M, but it feels big, especially sleeves and waist. I am 168cm (5'6"), 63kg (139lbs), 86cm (34") bust and 68cm (27") waist. If not layering with insulated jacket, then S would fit me just perfect, but on the other hand, with all layers including insulated jacket, maybe S would be too tight.