Ok... 

1. You need to go to the Aqua Lounge. Talk to the Bartender (The pink fish that serves
drinks at the bar). He will blab on about this squid of his. He wants you to scare the guy
at the Den.

2. The Bartender , (The pink fish that serves drinks at the bar), in the Aqua Lounge also
gives you a pair of sissors. Now you go back to Cloud Plaza and then walk over to wear the
Sky Tower is.

3. Go to Maru's Shop Of Stuff. He will give you a white cloth. Then, when it is in the
inventory, use the sissors to cut it and then it is a ghost suit!

(4. You can also finish the quest, but you should already know what to do byu then.)