Court dress is mentioned in many Regency romances, though I've never personally worried much about including that particular aspect of the Regency upper classes in my own books. However, it was a part of many a debutante's first Season, in which she was presented to the Queen of England.
The clipped image below is of the Marchioness of Townshend in full court dress in 1806.
The issue of La Belle Assemblée this was taken from includes a biographical sketch of Lady Townshend. If you'd like to read about her, you can find the Google eBook HERE. She is featured on page 16.
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