I was once in a local TV Christmas show, which we pre-recorded in the summer. We spent most of the time on set dressed in heavy victorian-style outdoor costumes. The cameras in use were old-style EMI types which needed higher levels of lighting than modern ones. We ended up doing about a dozen takes of "Walking in a Winter Wonderland" with polystyrene bead "snow" being tipped on us from the fly gallery - which was getting hotter and hotter each time that it was collected and re-used.

We had to try and cool down (and then be powdered off) after each take. That tip about running cold water over the insides of your wrists really works - with full make-up on and not enough time to get out of costume it was the only way we could get cool.