I know we can do it but I'd just like to know how. Do I just type something like 500 CSC in the price box? (I couldn't find the instructions in the forums but this doesn't mean there aren't any.)

CSC pricing is only available for Custom Clothing (R200) items.

If you have an R200 item in your shop, it will show fields for an sP and a CSC price next to it. You won't see this with other rarities.

Thanks. I've got some CWs I want to sell but haven't tried putting them in a shop yet. That's why I didn't know there was a CSC field.

PS: I should have said they were CWs in my opening post

No problem. c: I was confused too, until I tried dropping a CW in my shop.

I wish there was an error message if you wanted to price something else as CSC... I got an item from one of the chance machines at the Cash Shop and in my shop I wrote "125 CSC" into the price box, only to see it "autocorrected" to 125 sP D: I was really lucky that I checked it immediately...