He's very excited to be a hero …

I shouldn't consider members of the Legion of Substitute Heroes as candidates for "Bad Costumes", because the whole point of the group was to get laughs. But I dare you -- nay, I double dog dare you! -- to look at this costume for "Chlorophyll Kid" and not make some sort of "He's got wood!" joke:

Chlorophyll Kid

I know I'm going out on a limb here, barking up the wrong tree. And I ought to stem the tide of bad jokes, and just leaf him alone.I'd go on in this vein forever, without having to branch out too far, but UGO would probably make me petal my bad puns elsewhere if I did. And so I will quit in the full flower of my mockery, without being a complete sap, packing my trunk for home. I'll give you a ring or two before long, from the safety of my arbor, and hope I get you on the vine. Line. Whichever.

(Image and character ©1985, DC Comics, Inc.)