There is a description of Katherine Parr's toilet in Linda Porter's biography of her:
"The Queen's lavatory must have been one of the most opulent privies in the whole of Tudor England at the time.
It had a crimson velvet canopy, cushions covered in cloth of gold and a seat of crimson velvet for the royal posterior. A removable commode was covered with red silk and ribbons attached with gilt nails"
and that is based on primary sources so I expect Anne's would have been similar.

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