Rawdon Crawley by Joseph Clayton Clark (1856-1937) who went by the pseudonym of Kyd. Painted c. 1900.
 
 
 
 
 
 
 
 
 
 
 
One meets people of Becky's character on occasion, but Miss Violet's 'Camilla' threw me for a bit.... It is not explained in the text, and has no Classical analogy....
 
The picture above is taken from Kyd's characterisations of Thackeray's work (although Rawdon hasn't been introduced yet he does have splendid trousers (as befits a dragoon on leave or in service)).