I don't think I've seen a tut but the app is pretty uch straight forward. before you start make sure you have the P5Judy license.
Load the clothing, top window
Select what figure it was made fore,  called From. It will have a drop down list
Quality...High
Convert To, Select the figure from the drop down liat

Options
For a skirt, check the box. Note it will want to add body handled for you, Sometimes it's OK, sometimes not. Play with that option and see what works best for you.
If the clothes have morphs there is an option to transfere them.

I have read that people have used this option to transfer figure morphs to clothes and other figures. I haven't tried so don't knoe how well it works.

I must remember to remember what it was I had to remember.