WICF this lingerie set

This tumblr post appears to be the source of the image. There's no download link, but maybe you could message them about it.

If you don't have a tumblr account, you can still send an anonymous message and check their blog later to see if they've publicly answered. Or if you want, I can send them a direct message from my account.

You may have already tried this, for all I know, so sorry if this is useless advice. But fwiw, the image URLs are different so that suggests you may have found a re-upload, not the original source.