Will Vests stretch some??

well i bought a new 05 LF Hinge Vest online because it was a smoking deal,i usually buy local but couldnt pass this up..

so anyway i used to wear medium vest but two years ago i bought a Large and it turned out to fit but barely and got looser after use..

so i wanted a new vest and bought this one in medium which by my chest size should have fit ..

well it fits with the buckles all the way out and fits snug like just right kinda snug..

will it stretch or should i send it back before i use it??

my feeling is it will at least enough so it will fit nice and close but not break my ribs and let me breath when riding

??