Put it on and go to the docks. After you are there, sneak to the top of the docks and go into the building when no ons looking. Then, sneak past the dogs and get to the bottom. After you are there, jump on various things from the ceiling to get to the top of the safe. Once you get to teh safe, go through the hole in the top and free the trapped spy.
You do Dr. spyglasses' eye test and he tells you to meet him up stairs. climb up the ladder and walk in the door. talk to Dr. spyglass and he gives you the chameleon suit.
you don't
The chameleon suit - given to you by the spyglasses shop owner on Spy Island - will help you when you go to the Docks to save the first agent that the B.A.D agency have trapped. If you don't wear the suit, the B.A.D agents will fight you and you won't be able to get past.
The suit is given to you by Dr. Spyglass, who runs the Spyglass Eyewear store. (He is secretly a spy scientist.) (see related question)
You can only wear the chameleon suit on Spy Island.
On the eye test just do the opposite of the sign he gives you. Then you can get the chameleon suit.
you go to the ice cream place
if you have the chameleon suit, you don't need an eye exam.
go to Dr. spyglass's office and ask for an eye appointment. But instead of saying the right thing say the opposite of what he is pointing to. He will invite you upstairs throgh the door on the roof and there will he give you the chameleon suit.
go to the docks
You can get get past the guards by the satellite of B.A.D.
The chameleon suit.