Choose kids clothes made from natural fibers, rather than manmade materials.

This is because manmade fibers don't breathe as well as natural fibers and can be uncomfortably warm.

Keep the kids's skin covered as much as possible because the skin's sun protection system isn't entirely developed yet; this can cause the skin to burn more easily in kids.
Long pants, long-sleeved shirts, socks, and brimmed hats to avoid sunburn and sun glare are the best outfits for hot conditions.
Chemical-free sunscreen ointments or lotions can be applied to the kids's body, particularly on the arms and legs, where the sun's rays will probably directly hit.