US: 2T-4T to Europe Size 21-23
Cross-market children’s socks, tights, hosiery, leg warmers, and dance tights sizing conversion mapping 2T-4T specifications into 21-23.

Analyzing Size Equivalence Across Markets
US: 2T-4T: Corresponds to a foot length of 15.5 (6.1 ), matching US shoe size 8-9, and age range 24–48 months.
Europe Size 21-23: Corresponds to a foot length of 13.5 (5.3 ), matching US shoe size 5-7, and age range 12–24 months.