Your tailor sounds very well priced so this changes things. Also, if you have not had a suit made from him/her before (don't want to presume anything here), it might not be a good idea to invest in expensive fabric.
Harrison's is bullet proof. Fox is also durable depending on weight. My only experience with VBC has been with RTW flannel trousers and I was not very impressed. Does not hold shape as well and started to become shinny on wear points.