Originally Posted by 747
...And why is Superman so much more sensitive to this trunk issue than other superheroes? Characters like Batman and Cyclops has lost their trunks...
I think it the difference are the "iconic" elements so to speak. Batman's iconic elements are the cape and cowl and to an extend the glove scallops, not so much the color or actual costume. You could take every reasonably shade of grey, black, blue or add stuff and the figure would still retain what is important about Batman's design. The same with Cyclops, as long as he has the one visually iconic element of his design, the visor, you can put him into pretty much everything.
Superman's costume doesn't have unique iconic elements like that that's why design and color are such defining elements of Supes suit imho.