A successful foray to the collection of vintage clothes shops in Bournemouth netted a large satin skirt that works perfectly with the big petticoat, so I don't need to make a skirt just yet.
Hez - thanks for the pattern - I will try that out when I get some free time without distractions. Fortinately i now don't have to rush anymore before Lincoln.
Frances - thanks for the useful comments. As commented before, its not actually a hooped crinoline but a huge petticoat that we have (apologies for the confusion). However, when we visited my favorite vintage shop at the weekend they did have such a hooped beast hanging up and we may well pick that up if its still there next time