I'm wondering about sizing... I'm 5'7", 168lbs, I've got a Nano jacket and a reactor polar from marmot, both in Medium. The nano doesn't let me to layer up, I think is small for me. Does the Alpinist have a bigger fit or is it the same cut? If it's the same, should I buy a large one?

Tech Specs:

Material:

(Gore-Tex Pro 3L) , 94% polyester, 6% elastane stretch 

Fabric Waterproof Rating:

Guaranteed waterproof 

Fabric Breathability Rating:

Guaranteed breathable 

Center Back Length:

(sizeM) 30 in 

Venting:

yes, underarm zips 

Powder Skirt:

yes, zip-off 

Pockets:

2 front high pockets with water-resistant zippers, 1 napoleon with water resistant zipper, 1 interior mesh, 1 interior zippered 

Seams:

fully taped 

Hood:

yes, fulltime 

Weight:

1 lb 9 oz 

Recommended Use:

backcountry snow sports, alpine winter sports 

Manufacturer Warranty:

lifetime