Tante Trude aus Buxtehude

Tante Trude aus Buxtehude ("Aunt Trude from Buxtehude") is a 1971 West German comedy film directed by Franz Josef Gottlieb and starring Rudi Carrell, Ilja Richter and Theo Lingen. It was one of several German films in the wake of "Some Like it Hot" that used cross-dressing as a comic theme.
The film's sets were designed by Eberhard Schröder. Some of the film was shot in the Austrian city of Salzburg. It featured a number of songs performer by leading singers of the era.
Synopsis.
A group of friends try to recover a safety deposit box key which has been sewn into some old clothes and then sold. They track down the clothes to a ski resort but are unsure who actually has the key.