Choosing what to wear on the bike will depend on what they feel comfortable in, what is appropriate to provide protection from the season, the weather, the terrain. Learn more at What to Wear on the Bike. Bike underwear with padding (a chamois) sewn in offers the most flexibility. Worn like underwear – they goUnder their riding clothing of choice, everyday or recreational clothes, clothing in their wardrobe that suits the season, the weather on the day, their mood, and their changeable likes and dislikes. See Bike in Everyday/Recreational Clothes.
Traditionally – in the adult world of riding – bike pants are made of lycra with padding sewn in. See Bike in Lycra Padded Bike Pants. The other option is bike shorts that may or may not come with a liner (liners normally have padding sewn in).