Louis  BRIEN dit DESROCHES

Québec Généalogie - What is a 'dit/dite' name?  When the first settlers came to Québec from France it was a custom to add a 'dit' nickname to the surname. The English translation of 'dit' is 'said'. The Colonists of Nouvelle France added 'dit' names as distinguishers. A settler might have wanted to differentiate their family from their siblings by taking a 'dit' name that described the locale to which they had relocated. The acquiring of a 'dit' name might also be the result of a casual adoption, whereby the person wanted to honor the family who had raised them. Another reason was also to distinguish themselves by taking as a 'dit' name the town or village in France from which they originated. This custom ended around 1900 when people began using only one name, either the 'dit' nickname or their original surname.

Source: American-French Genealogical Society, Woonsocket, Rhode Island (www.afgs.org/ditnames/index1.html)

Louis was a Maitre tailleur d'habits.
It was in the year 1588 that the occupation of tailleur d’habits, or tailor, appeared in France. The tailleur d’habits referred to a tailor who made all items of clothing for men and women. In 1675, Louis XIV decided that women could also make clothing, but that they would be called couturières, or seamstresses, have their own guild, and could only make clothes for women and girls. In a nutshell, the tailor would cut, sew, make & sell clothing.
Source: tfcq.ca

Stitching Through Time: A Tailleur's Tale in 18th Century New France