Courtesy The CW

On next Monday’s episode of Gossip Girl, we learn more about the mysterious woman who may be Chuck’s mom. Blair stands by her man as he attempts to uncover the truth about his past wearing a D&G dress, Hue tights, Sorrelli bracelet and stunning Ranjana Khan necklace. Meanwhile, Dan and Vanessa  try unsuccessfully to date other people. Click on to get more dish on the upcoming episode (airing Monday, March 15 at 8pm EST on the CW) and find out exactly what the girls are wearing—head-to-toe!