How tight should a jacket be?

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Joined
20 May 2007
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1,042
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Stoke-on-Trent
Hi guys,
Im a complete noob to biking, i haven't even done the CBT yet but i have bought some gear.
I have a question about the fitment of the jacket i bought, i have a 38" chest so usually buy clothing in size medium. Medium in bike jackets seems to be 42" though so i went for the small size which is 40", however im not sure if its too tight.

My movement is not restricted and i can breath in it but i have to pull it together tight to connect the zip but it will then zip up easily. I understand that it should be snug to keep the protection where it should be but how tight is too tight?
 
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