This shot is the central piece from the ‘Hercules’ Twelve Labours Mosaic‘ in Llíria – Spain. The motif depicts the myth of Hercules and Omphale, the queen of Lydia – in Asia Minor -, to whom Hercules served as a slave, as the son of Zeus tried to purify himself for the murder of Iphitus, as the oracle proposed for his crime. The iconography carries on to represent the exchange of apparel: Omphale with the club and Lionskin and Hercules with feminine clothes and attributes.
The exchange of clothing in the representation of this myth can be conferred in others specimens of art, such as Bernardo Cavallino’s Heracles and Omphale painting from the 17th century.
Above is a cut from the photo of: Carole Raddato from FRANKFURT, Germany, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons