No size tag , Fits like 10-12 or Tiny adult would fit.
(please see the measurements below for the best fit)

Chest : Approx 14-18’ (35.5cm-45.5cm)

Waist(elastic) : Approx 9’(23cm)-19’(48cm)

Length : 34’(85.5cm) 

Arm :8.5’(21.5cm)

Model: 5 years old, 42in/105cm, 44lbs/20kg