Everything she needed was inside. These models were common in her day and served as portable closets. The main compartment contained her gown, shoes, and a box for her chapeau.
Within, she also found two pistols, ten full magazines, and an equal number of throwing knives. Every weapon was sheathed or holstered, enabling her to carry them on her outer thighs. The ruffled lower half of the dress would conceal their presence.
While some preferred to wear weapons on their inner thigh to reduce the chances of discovery during a pat down, Clara found the loss of mobility problematic. Not to mention I’d end up walking like a cowboy.