The size is too large, it is recommended to choose a standard size or one size smaller

it is more correct to compare with the height:
(Unit：CM)
L=4T：length=59 bust=69 sleeve=43, fits for: 105-115cm height / 4 Years Old

XL=5T/6T：length=61 bust=72 sleeve=44, fits for: 115-125cm height / 5-6 Years Old

XXL=7T/8T：length=63 bust=75 sleeve=45, fits for: 125-135cm height / 7-8 Years Old

XXXL=9T/10T：length=65 bust=78 sleeve=46, fits for: 135-145cm height / 9-10 Years Old
Note:
1.There is 2-3% difference according to manual measurement.(1 inch = 2.54 cm)
2.All measurement in cm, please note 1cm=0.3937ch, 1 inch=2.540cm
3.Please check the figures carefully and order the right size, don't completely depend on the " age advice". It's just for reference.

Size Table 2

it is more correct to compare with the height:
Unit: CM
L=4T：length=58 bust=81 Sleeve =40; fits for:110-120cm height / 4 Years Old

XL=5T/6T：length=61 bust=85 Sleeve=42; fits for:120-130cm height / 5-6 Years Old

XXL=7T-8T：length=64 bust=89 Sleeve=44; fits for:130-140cm height / 7-8 Years Old

XXXL=9T-10T：length=66 bust=93 Sleeve =46; fits for:140-150cm height / 9-10 Years Old
Note:
1.There is 2-3cm difference according to manual measurement.(1 inch = 2.54 cm)
2.All measurement in cm, please note 1cm=0.3937ch, 1 inch=2.540cm
3.Please check the figures carefully and order the right size, don't completely depend on the " age advice".