Costumes can be reskinned with alternative colours etc. but it can be quite time consuming. I enjoy doing it, but what I don't enjoy is having to repeat your work 6 times for each of the 5 armor pieces, as costumes/armors come in 6 different versions, one for each race/gender combination, so you end up having to make 36 textures for one costume and hat or armor set. Some of them are very similar so you can take some shortcuts here and there, but it still takes some time.
Not sure what you mean about emails for char deletion.