The size 10 in J.Crew/ Crewcuts is closest to the following:
Brand Label Weight (lbs) Height (inches)
American Apparel 12 years 62 - 75 lbs 55 - 59 inches
H&M 7-8 years - 50 inches
Hanna Andersson 140cm 62 - 80 lbs 54 - 58 inches
Hatley 10 - 56 inches
J.Crew/ Crewcuts 10 73 - 76 lbs 55 - 56 inches
LLBean 10-12/M - 53 - 58 inches
Marimekko 10 yrs/140cm - 55 inches
MiniBoden 10y - 55 inches
Ralph Lauren 10/ M 63 - 73 lbs 54.5 - 56 inches
tea 10/L 72 - 82 lbs 54 - 57 inches