I don't think there is such a thing as a tutorial on how to model clothes. Modelling clothes fir Poser figures, in just about any 3D modeller is a fairly advanced process. 

Knowing how to make them comes out of experience modelling smaller pieces... then once a person is familiar with the tools in the application and shapes and objects those tools make, that can be put together into making a piece of clothing or something else organic.

In other words, there really is no 'straight path' to modelling something as complex.

You can't go wrong with going through tutorials on how to model simpler things, and how to model organic shapes.. Even if they're not clothes.  When making clothes, you'll end up using most of the tools that a modelling application has.

Start with modelling in general. How to make clothes will sort of fall into place once your modelling skills get to a certain level. We all started with making squares and circles and simple things first :)

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