Check back at the site, because there are several tutorials. Also, if you click on the Filters tab on their site there are over 11,000 filters there for download. If you're looking for something, search and see what they have. That'll make things a little easier.
Once you look at the tutorials, that will give you ideas on how to edit filters you find on their site to best suit what you need. There will be trial and error, but unless the filter you download is very detailed, you shouldn't have too much trouble editing it. There's a very large selection of all kinds of items, not just cloth.
Oh and a lot of the filters come with a number of variants, so you if you see something you like, but it's not the right color(s), just check out the variants because there might be something close to what you want.