Cath Kidston clothes and sizing

[toucancancan]

I've never tried on or bought any Cath Kidston clothing and would like to buy some on ebay. Are her sizes spot on or quite small? I'm usually an 8 or a 10, but i've seen a nice top on ebay in a 12 though i'm not sure if it'll be far too big. Anyone know what her sizing is like?

Coincidently, I bought CK dress the other day having never even seen the clothing before. I'm a size 11. The Small fitted but tightly. The Medium fitted slightly better. Not sure that helps you really but I would say the 12 will be big on you