I am truly hooked on the costumes, they are beautifully designed and made, although I don't know much about the fashions of that period, the designer, Terry Dresbach and her team appear to have made tremendous efforts to get the costumes to look right, so no obvious zips or velcro, which is a good thing as far as I'm concerned if you're trying to get authentication on costumes.
A confession from me, I often watch 'period' dramas to see how the costumes are made and lose a lot of interest if they are made in too modern a way with zips etc. While I appreciate that a production might have a lot of costumes to be made for extras I really think that effort should be made at least with the principal actors to make the costumes as far as possible, authentic looking.
I suppose this is one of the reasons why I have been so pleased to watch this programme, to see the men wearing genuine Great Kilts in muted colours, not the gaudy Victorian kilts that are thought of by most people as being Clan tartan, and the women wearing the lovely muted colours that look like the Scottish scenery where the filming was done. I would love to see an exhibition of the costumes, and who knows, maybe they will one day go on display somewhere in the UK, then I can indulge myself in trying to find out what the fabrics are. I would especially love to have a closer look at that wedding dress, to me it looked like linen on the overskirt, certainly looked like plain weave in the close ups that I've tried to get, and the embroidery is utterly stunning, although I did see a little video & it is unfortunately machined not hand stitched.
They have apparently just wrapped filming on series 2, much of the storyline is based on late 18th century Paris, so the look of the costumes will be very different, just look at these beauties.