it is more correct to compare with the height:
(Unit：CM)
120=5T：length=64 bust=84 shoulder=35 sleeve=41, fits for: 110-120cm height / 5 Years Old

130=6T：length=68 bust=88 shoulder=36 sleeve=44, fits for: 120-130cm height / 6 Years Old

140=7T-8T：length=72 bust=92 shoulder=38 sleeve=47, fits for: 130-140cm height / 7-8 Years Old

150=9T-10T：length=76 bust=96 shoulder=39 sleeve=50, fits for: 140-145cm height / 9-10 Years Old

160=11T-12T：length=80 bust=100 shoulder=41 sleeve=53, fits for: 145-150cm height / 11-12 Years Old
Note:
1.There is 2-3% difference according to manual measurement.(1 inch = 2.54 cm)