Pfft, no duh she's unemployed. She's wearing BRIGHT RED. Ninjas are stealthy, wearing bright red != stealthy...
Ninjas didn't wear anything that would identify them as ninjas, the kunai is popular because it's a gardening tool and as such would not be very suspicious during a search. These days ninjas would probably wear a suit and a silenced Walther PPK (or various movie-inspired equipment in the case of a Russian one, the Soviets thought US spies had all of those Bond gadgets so they wanted to keep up with that technology). Female ninjas usually assumed the jobs of prostitutes (although the existence of female ninjas is disputed, "kunoichi" are probably the creation of fiction writers).
Izuna is a fiction ninja with all that magic stuff so she could probably bust in through the front door and annihilate an entire army. If I had people of such power I'd probably not dress them in stealthy garb, I'd make them visible from far away so my enemy would panic long before the actual slaughter begins.