Well you don't necessarily need a PZ2 as your using Poser 7, you can save it as a material or a material collection.

Take the template into a program such as Photoshop or Paint Shop Pro, a graphics program that can handle layers is best. Create layers above your template and using the template as your guide, create your texture. Once you're finished you can flatten the layers (discarding the template) and save in a format readable by Poser -- jpg, png, even psd.

In the material room,  manually apply the texture to your clothing, then click the plus button and add as a material or it the clothing has many parts and you're using many texture files, a material collection. The pop up dialog will ask you to select one or the other.

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