Adam Clarke on Luke 12:37

He shall gird himself - Alluding to the long garments which were worn in the eastern countries; and which, in travelling and serving, were tucked up in their belts. That those among the Romans who waited on the company at table were girded, and had their clothes tucked up, appears from what Horace says, Sat. b. vi. l. 107: Veluti Succinctus cursitat Hospes, He runs about like a girded waiter. The host himself often performed this office. And ibid. viii. 10: Puer alle cinctus: and that the same custom prevailed among the Jews appears from Joh 13:4, Joh 13:5, and Luk 17:8. From this verse we may gather likewise, that it was the custom of those days, as it was, not long since, among us, for the bridegroom, at the wedding supper, to wait as a servant upon the company. See Bishop Pearce.