If you can see skin, UV can reach it. Try to cover as much skin as possible with cool, loose-fitting clothing. If a child is wearing a singlet top or dress with thin straps, don't forget to layer up with a t-shirt or shirt before outdoor play.
More tips on how to choose sun-protective clothing
Does your child’s school uniform or dress code include sun protective clothing items that follow the Australian sun protective clothing standard? Make sure your children are being well protected when they need it most. See Top Tips for Sun-Protective School Uniforms