Duvet cover

I love this pattern but I really want to change it. We have a back-up cover but its been eaten by the mice so a bit scratty looking. In July I bought another but I took that to France and it was left there as the colours all work well together. What I'd loe to do is scour the charity shops up in mid Wales for some antique linen - I don't mind them just being all white - I love the crispness of it.