You could create a variable for the color of his suit, and whenever they change suits it changes the variable to that number.
That would also help change the graphic whenever they change suits.
I think there is an ocarina event system somewhere i think maybe at rmrk not sure, but i know it exists.
When you do find a system, just change the part where it changes the graphics into 3 conditional branches. If the variable = 1 it changes the graphic to link in green, if the variable = 2 it changes it to red, if the variable = 3 it changes it to blue.
I made a system for this on my game, but after i finished the game and gave it to a friend i deleted it lol.
I will try to find you the system and make a demo with the changes and all that,