Wiktionary
robelike
a. Resembling or characteristic of a robe (item of clothing).
Usage examples of "robelike".
It was a cool evening thanks to the rain, so I was dressed in loose-fitting breeches and a robelike shirt that came to just below my hips.
The other adjusted a pleat on his red robelike garment so it draped precisely like the others from shoulder to floor.