"Are we there yet?" she captioned the post, adding the hashtags, #lockdownweek5 #justgetthrough, #formalfriday and #paraireōkawa.
Earlier this week she revealed that during Te Wiki o te Reo Māori, Formal Friday would become Paraire ōkawa (Friday formal).
This week's outfit struck a note with countless others who commented on her post.
"SHE IS ART! GET THEE TO TE PAPA!" wrote Kiwi actress Madeleine Sami.
"You sum it up perfectly, but still look amazing," wrote another.
Last week, Barry gave her formal Friday outfit a sporty twist.
She shared a photo of herself in a white dress and her signature tiara.
"Donned my whites for a bit of backyard cricket. Had to watch out for Mr B's googly though," she shared on Twitter, showing off her batting stance.
Her followers shared their delight at her formal Friday outfit - and it inspired a hilarious meme.
"This! This is what NZ needs on a Friday," a Twitter user shared. "Thanks @Hilary_Barry for making my day!"
Another person shared: "We've just been knocked for 6, Hilary! Knockout!"
"Haha ... loving the memes," Barry added later, re-posting an epic photoshopped version of her formal Friday outfit.
"Who would have thought my brief tenure in the Queen Margaret College 1st XI would take me so far?