While we may not be able to get an exact description perhaps we can get an idea from a strange source such as paintings done during the Crusades by various artist drawings of famous battles.
This is quite typical of what the European artists of the Era drew
While these would be several hundred years after the time of our Prophet(PBUH)
I doubt if the clothing would have deffered from what worn at the time of the Prophet(PBUH)
The clothing does seem to resemble a throb.