Short sleeve tee. Rib knit crewneck collar. Dropped shoulders.
Model is wearing a 05. Model is 5’9”, a US 2 in dresses & bottoms, 26 denim and S in tops.
Issey Miyake's garments are intended to accommodate any size woman. The numerical sizes are based on the length of the garment. Based on your desired result, as the numbers increase so does the length.