"This is my daughter's nightgown and PJ shorts," Frankel, 43, captioned the image. "Think we're ready to start sharing clothes yet?"
The former Real Housewives star's post comes one month after she settled her years-long divorce battle with ex Jason Happy and four months after her talk show Bethenny was cancelled.
"I felt edited and diluted, a little bit controlled," she told Bravo's Andy Cohen at the time. "And I'm not really great when I'm shackled. As you know, you have to kind of unleash the beast."
Rumor has it that Frankel will next star in a new Bravo show produced by Cohen.