None. The mech uniform pales in comparison to a F/A uniform intended as a marketing tool. The mech uniform is functional and meant to get dirty once in a while. Besides, there is nothing attractive about a person unplugging a clogged lav or wandering around the ramp blind w/ LD4 is their eyes or covered in carbon dust up to their elbows from a brake change on a two hour turn-around, and all this in the sweltering summer heat. Of course there is the reciprocal: the clean fashionable lines of a parka wrapped around a work shirt/pant combo, long johns, thick woolen socks and boots with a bonus frozen brown trout from a winter lav problem.