So the organic cotton feels nice and is stretchy, I expect it to shrink a bit with washing & drying. Adult sizes are more accurate, I am 5’7” 150 lbs can wear a women’s medium or large, I’m glad I got the large because it fits more loosely which is what I was hoping for. My husband is 5’10” on the slender side, he got the XL and it fits nice, on the baggy side which he also wanted, the sleeves are just a little long.
Now the kids sizes run small so I would size up 2 sizes, my 7 yr old girl just outgrew size 6 clothes and she needed the size small pajamas (XS was too small, have to return) My 9 yr old girl normally wears size 10 clothing and she needed the size medium pajamas (S was too small).
The one piece baby pajamas seem true to size but I have a 3 month old and I wish they had size 3months, the only options they provide are 0-3months or 3-6months, I got the 3-6 and as expected they’re a little big, hopefully they shrink enough in the dryer that it will be okay.
Overall I like the pajamas and I feel the price is decent