The clothes of Cletus are in the washing machine. The laundry sect is waiting the Seer (in one of the hotel rooms) to come and speak to them.
This is the low-spoiler guide for "How to get clothes from the laundry sect" puzzle in Goodbye Deponia. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.