you're in a skin tight outfit that's almost two sizes too small and add some body armor style that doesn't move but in one piece, then, yes, your chest will rise and fall like that as well. let's not forget she had on a pushup, well in this case, taped up so that added to the effect. take into account the times, then you got the perfect setting for the series.
Actress Linda Carter said people would tease her, "Make the wings flap! Make the wings flap!" She didn't mind, though more recently she's a bit more conservative about her past...
Wonder Woman's cleavage is always rising and falling when she is breathing hard.