Dress: Azalea Dress in Cobalt by Self Portrait
Kara Danvers (played by Melissa Benoist) on Supergirl on The CW was spotted wearing this blue lace dress on Supergirl on episode 'Crisis on Earth-X (1)' (3x08) in Nov 2017. Kara's Dress is the Azalea Dress in Cobalt by Self Portrait.