Before doing any humiliating act with your cuckold, hotwife should discuss that in detail with her cuck. Many cucks are not keen on humiliation and they just want to the action between hotwife and bull without cuck being subjected to any humiliating act or even verbal humiliation. If your cuck is not cool with humiliation, please don't ******* him. If hotwife cannot exclude humiliation part and cuck is not willing for humiliation, please discuss, try to convince each other and reach common ground before jumping to action. Otherwise better not to enter this lifestyle.
For cuck who is ready for humiliation, there are countless ways to humiliate starting from just verbal humiliation to much extreme acts. It is upto the cuck and hotiwife to decide what is the acceptable level. Some cucks are content with verbal humiliation only. Some are willing to go to next levels such as doing bull's work such as washing his clothes, obliging to the demands bull and hotwife during session, cleaning up hotwife, giving hotwife/bull the control of his orgasms etc. However, the cuck should be willing to accept that level of humiliation if you want cuck to remain turned on.
Some might think asking cuck to wear hotwife's bra and panty could also be a kind of humiliation. I personally disagree. Moreover, this should not equated with cuck becoming sissy because sissy has many additional criteria to fulfill. I think cuck invariably must wear bra and panty when bull is fucking his hotwife to assure that bull is the only one to perform manly role in the action and cuck is willing to surrender his manly role.