ThermajohnThermal Underwear for Kids, Boys Thermal Underwear Set, Base Layers for Skiing, Long Johns for Boys Kids

My son normally wears an 8 but I did the measurements on the chart and they don’t make sense. What would a small 11yr old wear!

Sizing? i have never bought this brand. where’s your sizing chart??

If my son normally wears a 3t what size would i order?

Can they go in washer? Dryer?