Arcadia, which was already forced to shut stores and restructure, could file for administration in the U.K. as early as next week, according to reports.
He will start his new job on Jan. 2.
They are trying to promote inclusivity and avoid reinforcing gender stereotypes.
The appointment comes as Sir Philip Green shakes up the management ranks at Arcadia and its parent Taveta.
Gallagher is the face of the high street retailer’s fall look book, Casely-Hayford has done tailoring for the brand.
Man will mount a group runway show held on June 10 at The Old Truman Brewery.
Topman continues to support MAN, together with Fashion East.
This is the second time the designer has collaborated with the high street label.