Corrected entry: When Batman saves Robin from falling during the climax, right around when Robin says "Thanks", you can see that both the Batman and Robin costumes have hidden "vent-holes" cut into the underarms (likely to help the actor's skin "breathe" and to help air circulation keep them cool in the heavy costumes), with nothing but black cloth underneath.
Guy
16th Jul 2012
Batman Forever (1995)
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Correction: The vent holes could just as easily be a intended part of Batman and Robin's costumes to help the characters' skin "breathe" and to help air circulation to keep them cool in the heavy costumes.
Guy