There are many outfits with a tied shirt, but the closest is Hongyu Sportbaby 2 https://www.renderosity.com/mod/bcs/index.php?ViewProduct=73336
The overall form of the shirt, the knot, the folds, etc are very very close.
What is surprising is to use a 15 years old v4 outfit to advertise a g8 panty... But Hongyu clothes are so good.