If my regular T shirts are size SMALL and i get a size small for this jacket, will it be to tight?

Tech Specs:

Material:

[Shell] HyVent ripstop and HyVent 2L [Lining] nylon taffeta 

Insulation:

550 fill goose down 

Waterproof:

Yes 

Core Venting:

None 

Seam Taped:

Yes, fully 

Powder Skirt:

Yes 

Hood:

Yes, removable 

Pockets:

2 chest, 3 interior, 2 hand 

Weight:

4lb 4oz (1930g) 

Recommended Use:

Mountain and casual wear 

Manufacturer Warranty:

Lifetime 

Country of Origin:

China