, triggering a revival in the late Princess's most memorable looks.
While always a fashion icon, revered with the likes of Jackie O, the hit series chronicling Charles and Diana's relationship and dubbed "The Diana Years" has brought her '80s and '90s pieces back into vogue.
The Sun newspaper reports more than 29 million viewers tuned in when it was released, the key glamour role played hauntingly well by Emma Corrin.
And it's not just Diana's relationship with Charles that people are critiquing.
It's her fashion.
Think pilgrim collars, power suits and kitsch jumpers.
Fashion critics believe it was Diana's visibility as a royal that cemented her status as a fashion icon - an influential path that her daughter-in-law Catherine, Duchess of Cambridge, is also making her own.