Femmy Cohen worked in October 1941 as a seamstress with the lingerie- and ready-made clothing company SIDVA (Simon de Vries Ateliers) in Amsterdam. She then had been in office for three years. At that time Femmy Cohen was not married yet.
Lijst van Joodsch Personeel-SIDVA Oct. '41
September 1942 Femmy Cohen married with 509414.
City Archive of Amsterdam, card Femmy Cohen