Just me talking about costume-y kind of stuff
The V&A Theatrical Collection
Katherine of Aragorn's costume from Six was the newest installation in the exhibit and in fact they were filming the installation while we were there. There were other new costumes such as Satine's Diamond from Moulin Rouge the Musical, Lola from Kinky Boots, Shirley Bassey's costume from Diamonds are Forever, a corset/flying harness from Peter Pan, a Stormtrooper, Solange from Follies, and a recreation of Kylie Minough's dressing room.
Harry Potter and the Cursed Child
Costume Design by Katrina Lindsay
There's a book out called Harry Potter and the Cursed Child The Journey. The Wizarding World published excerpts from it in 2019. The links are below.