The icon looks like a bathrobe laid flat. It is about knee-length, with wide sleeves reaching to the waist. There is a line across the waist to look like a tie. There are lapels on the collar part of the robe, the right panel overlapping the left.
This page shows the different variations of the Kimono from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.