I was surprised by the quality of these jammies. I don't like to purchase anything but 100% cotton jammies without any kind of flame retardant, and these fit the bill. The kids were so excited their elves brought them matching jammies so they too can be elves.and they are costumes.not jammies. So they wear them all the time, including to their virtual classroom. Highly recommend. The size 3 fit my 3.5 year old very snug (Hes going through a growth spurt and has a bit of a cute belly right now). The size 6 fits my 7 year old well. Long enough for her legs, and still fits around her waist without falling down.