never, I find that happens if the buyer is pulling money from their bank account rather than a cc. If you open up the transaction details, it usually says pending. I don't dispatch till that changes to cleared.
soylo, I bought the Frances trousers for work - I do a lot of training and they are ideal for being on my feet all day. I bought 12s, but I would say when I bought them just after Christmas, I wasn't a true 12 across other brands, and they only fitted because of the elastic waist. Now that I'm more a true 12, they are certainly sitting lower on my hips and I may not get that much longer out of them. So unless you are pushing a 14, I would go for 10s.