All gear must fit you snugly to be useful or it could ride up on you or bunch. Loose gear is bad. So, do you think leather gear or textile gear is more likely to have baggy, catchable spots?
Ignoring the (perceived?) superiority of leather to deal with abrasions, it would seem to me that leather is more likely to avoid such incidents.
And if this guy was wearing chaps and fringe, well, let's just say that probably wasn't the best safety or style choice.
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