This is a 4 piece outfit consisting of the following items.
Shirt - checked pink and purple Phineas Cole shirt, It has 'CONNORS' written in marker into the inside of the collar. The right sleeve is also folded up since Curt Connors only had 1 arm.
Tie - Brown with dark crimson diagonal stripes. It's 100% wool
Belt - Brown Ralph Lauren leather belt
Pants - Brown/Taupe in color courdroy pants made by Michael Bastian. The inside has 'CONNORS' written in marker.
It also has a costume tag which is listed as Fionas Tale which was the codename for the movie. And it describes the scene as 'Peter shows up to talk to Connors'