This really bothers me- These are not princesses in armor, these are princesses in metal push up bras. No warrior worth there sword would leave there midriff and thus some of the most vital and unprotected organs exposed.
Cosplay tips: This was my favorite! Plastic boning (like for corsets) aren’t made to be worn for long periods of time. If you’ll be wearing your costume all day (or many days like they do at the conventions) industrial strength zip ties from Home Depot are a great substitution.