I have a pair of used Tuff Rider breeches that are a size 6. I bought them used at a consignment shop and my daughter wore them for her lessons. They are red and are well-used, but still have lots of life. If interested, I'd like $12 shipped in the US.
And, if you need paddock boots I have some black ones in size 11 and 12...the 12 are brand new, the 11s were worn less than 5 times.