I am 5'4 but athletic build from gymnastics. Very broad shoulders/chest - will I have issues with this jacket? I am a small - should I get a medium?

Tech Specs:

Material:

[Shell] Westech-15 

Insulation:

[Removable liner] fleece 

Waterproof Rating:

[Shell] 15K 

Breathable Rating:

[Shell] 10000g 

Core Venting:

[Shell] Underarm zips, Vader front collar venting panels 

Pockets:

[Shell] 2 front, 1 internal goggle with snap-in goggle chamoix, stash pass pocket, internal iPod, internal mesh, hidden ID; [Liner] 2 front 

Seam Taped:

[Shell] yes, fully 

Powder Skirt:

Yes, removable 

Hood:

Yes 

Zip-in Compatibility:

Yes, removable liner included 

Recommended Use:

Snowboarding 

Country of Origin:

China