"Jack Hulbert and his wife Cicely Courtneidge had been major sight-gag comics in the early thirties, making highly popular comedy-thrillers much in the style of Harold Lloyd. But from the late thirties on they adopted a new style, bringing to the screen their popular West End musical comedies. Under Your Hat is as much of an exact stage-to-screen transference as the Marx Brothers' Animal Crackers, and a delightful record of a typical London stage show of the period. Entirely amiable, set in a pre-war Cannes, it even refuses to give a nationality to its rather likeable enemy agents, even though World War Two was by now well under way. The songs and comic patter are delightful, there is a wonderful and lengthy highlight where the two Hulberts pose as pukka English Sahibs and try to enroll their make-believe daughter in a posh finishing school, and Courtneidge gets a chance to remind us what a wonderful song and dance performer she was." -William K. Everson