Interesting saying. Know what it means?
“Gird” as in girdle. For the toga-wearing set, the flowing robes normally let the breezes waft in and a very pleasant state of being dressed was enjoyed.
When conflict escalated to Go Time, a person folded their toga by stuffing it front to back between their legs, and divided it. The flaps were brought up to the front and knotted. Now the wearer’s free to maneuver and feint in a fight. Fun link to illustrations
Just a thought