These specific Apparel classes are meant to help make Persistence.define() passages much more clean and concise. You can achieve the same thing with GenericApparel, but then you'll have to specify the slots and femininity data for every article of clothing. These specific Apparel classes provide some useful defaults.
These are Apparel types that correspond to jewelry. They derive from GenericApparel, and thus provide no min/max femininity values or bonuses. The defaultSlots of each class are overridden with the values specified in the class definitions.
FIXME: We probably ought to derive these from Womenswear instead.