It's likely that many of Rory's dresses were sourced from various designers and stores, reflecting the trends of the time period the show was set in (early to mid 2000s).
While the exact designers might not be publicly known, some of the popular brands at that time that could have been used for Rory's wardrobe include:
* Gap: Known for its classic, preppy style
* J.Crew: Similar to Gap but often with a more trendy edge
* Banana Republic: Offering a slightly more mature and sophisticated style
* Old Navy: A more affordable option for casual pieces
* American Apparel: Known for its trendy, basic items, particularly in the early 2000s
It's important to remember that the show's costume design was intentional in creating a sense of Rory's personal style and character development throughout the seasons. Even if the specific brands aren't always clear, the overall choices reflect Rory's evolving fashion sense, from her early college years to her later career and relationships.