|Blousey. Fab wardrobe.|
Of course, every decade makes its costume dramas according to what's currently fashionable, and there's a weird interplay between current fashion (which may itself be taking retro influences from another decade) and the styles of the past. Who doesn't love a bit of 70s-does-30s/40s? So you've got Mia Farrow's floppy hats in Gatsby, which are as much in keeping with 70s fashions as they are 20s, and an awful lot of sideburns and brown in the 1970s version of Poldark. So, in the programme I've been watching, pussybow blouses abound, and lipgloss is more common than red lippie. I'd say the hairstyles are the most glaring difference. (There's probably a lesson there for anyone seeking to recreate a vintage look... especially me, with my unkempt mop of hair.)
On top of the influence of fashion, even if a designer strives for authenticity, they're always going to pick and choose based on their own tastes from another time, or need to convey the impression a director wants (I recall seeing an interview with the costume designer for Marie Antoinette, starring Kirsten Dunst, saying the director sent her a box of macaroons for inspiration, and you can really see those macaroon colours coming through in photos). The most recent film version of The Great Gatsby was stunningly inaccurate as far as the costumes went, but presumably they achieved the required effect.
Do you find watching costume dramas or historical films from other decades jarring? Do you like the effect of blended decades? I think as long as there's enough of the intended decade in something, I don't mind it also carrying traces of when it was made - it's a matter of balance for me. After all, many of the things I enjoy now will doubtless look horribly dated in a couple of decades' time.