There's a lot of tutes and discussions on clothes modelling and rigging. There are a number of us doing this on Mac -- and at least two other people I know using Carrara on a Mac! Regarding Tailor, the "shrink fit" approach to making the first fit can be done in Poser5, using the cloth engine. I haven't gone through the process of creating a full-body-morph this way, though! I'd prefer to run Tailor on some approximation of a Win machine. As a Carrara user you may want to look into Eovia's Hexagon -- cross-grade is very cheap right now. You will want to get into poly modelling/Vertex Room to get the most out of your Poser clothing design, in any case.