I hadn't heard of this series, had to google it.
I see that this six part series is not being shown here in Scotland nor in Northern Ireland which may explain why I had not heard of it.
Much of television costume drama involves a level of speculation or guesswork as to what people would have worn in a particular historic era, although there seems to be general acceptance that many nationalities shared the culture of wearing a belt with a pocket for carrying rations of food etc.