i'm 5' 8" with shirt size 16/33 and suit size 40. should i order the medium or small? My dad has the Continuum down jacket in medium and that fits me snug.

Tech Specs:

Material:

[Shell] Gore-Tex Performance Shell; [Lining] Ultrasoft / Ultralight 20D nylon 

Insulation:

600-loft goose down 

Waterproof Rating:

Guaranteed 

Breathable Rating:

Guaranteed 

Core Venting:

Underarm zips 

Pockets:

1 Chest, 1 Pass pocket 

Seam Taped:

Yes, fully - Gore-Seam Tape 

Powder Skirt:

Yes 

Hood:

Yes 

Zip-in Compatibility:

No 

Recommended Use:

Snowboarding in cold conditions 

Manufacturer Warranty:

Lifetime