These are interesting photos.
The pants the mic handler is wearing seem too bulky to be simply leggings - notice the bulkiness behind the slightly bent knee - they appear to be pants to me. The dress being worn over them makes this sort of a blend of the traditionally accepted and the taboo, perhaps a slight step in a new direction.
The light blue pants of the young man in service seem too bulky to be dress slacks too, again notice the bulkiness behind the knee. They appear to be jeans to me, but I can't be certain.
I remember the use of women too, where there were not enough men to do the basic duties, but you didn't have to be a ministerial servant to handle the microphones, at least not in the 2 congregations I was in.