The jacket is made with the aim for perfect fitting please try and endeavour to pick sizes as reccommended from the size chart   

if you are still in doubts Medium can only be worn  average size 12 year old an adult size would start from L and XL average size  adult person.  Best fits for a 6ft adult due to the arm length is a 2xl dont feel tempted to pick medium looking for fitted it has already been designed with that in perspective 

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