Which is more unsafe: Wearing a t-shirt on a bike or shorts on a bike?

Just depends upon where you enjoy pain more. Do you prefer no flesh on your legs or your upper body. Might just as well ride naked and enjoy the pain all over
 
Neither is unsafe unless you crash the bike... Then BOTH will result in serious skin abrasions and lacerations. Some bikers call this 'pavement rash' and believe me... it hurts for a long time!
 
Depends on whether serious road rash is worse on the legs or the arms - both sound like they'd ruin an otherwise pleasant ride.
 
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