Blue Monkey
Archon Without Portfolio
Check the description of the sculpture here. "a Greek warrior has been coopted into the role of dvarapala. The evidence includes his hairstyle, tunic, and boots. In his right hand he holds a grape plant (closeup), emblematic of his origin." His style of clothing is similar to the figures in the relief at Sanchi known as "foreigners worshipping stupa".The shirt is taken from a sculpture at Bharhut (it's in the first spoiler in the link from ShiroKobbure). Most places I've seen say it's Indian, although wiki says Indo-greek.
Also from Sanchi, the topmost figure holding a mace clearly shows the style of turban and the long sash. A more detailed figure of similar style. A battle scene from Sanchi portrays combatants wearing banded armor that covers the torso but leaves the shoulders free . The turbans with the front knot as well. That style of armor would seem to be appropriate for high-caste (elite) units. It would be consistent with Porus' shoulder wound (despite wearing arrow-proof armor according to contemporary accounts) at the Battle of Hydaspes River in 326 BCE. The relief does show the style of shield you previewed - guess I had Tamil region in mind rather than strictly Mauryan.