If you're riding through the neighborhood by yourself, it doesn't much matter. If you go do a bike rally with several hundred or thousand other cyciists, then you'll feel out of place in jeans. If you ride when it's hot, cycling clothing works better. If you ride when it's cold, cycling clothing works better. You may be thinking about what you look like as you ride, but nobody else really cares.
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"be careful this rando stuff is addictive and dan's the 'pusher'."