Brave Fine Art has dated this piece to the 1850s.
At around the same time, gentlemen tended to wear matching waistcoats and trousers, so as you can see, this dapper chap certainly fits the bill.

It’s likely that the portrait was originally created over a photographic base, which was a common technique in the 19th century.
Medium: Gouache on paper
Size including frame: 10¼” x 8?” / 26cm x 22cm x 4cm
Year of creation: c. 1840 - c. 1865
Condition: Artwork in fairly good condition with one mark on the gentleman’s left arm. Frame with age-related wear.
Brave Fine Art has dated this piece to the 1850s.
Exquisite antique paintings that capture the imagination.
You can view the stock and full dealer information on the Brave Fine Art Profile Page