In the 1930s, many commercial graphic artists were still able to make a living as pure fashion designers. This changed in the 1950s, or at the latest the 1960s, when fashion photography completely replaced fashion graphics. Grimm's talent for drawing people led him to this field almost automatically in the mid-1930s. Most of his drawings, however, were not commissioned works as early as the end of the 1940s, but pure fantasy products.

He drew his inspiration from various international fashion magazines. In the late 1940s, in the early 1950s, the "dame en grande robe" dominates as a motif, later on, clear influences of contemporary fashion trends by Dior and others (H-line etc.) can also be discerned.