"The portrayal of people has nothing at all to do with trying to achieve a particular rating, it has everything to do with portraying people appropriately to the circumstances they find themselves in. "This is the basic premise behind people saying a lot of fantasy art, like that of Frank Frazetta, is "wrong" and that the Women in Sensible Armor Tumblr is the only way to be "correct". There is an objectively appropriate way for people to dress in certain circumstances, and all fantasy / adventure media, regardless of rating, should adhere to that.
The problem of course is that there's no consensus on what is an "appropriate" way for people to dress in the real world. Even in the same office you might find some people wearing sensible shoes, long pants, and a conservative shirt -- and at the same time others in high heels, very short skirts, and low cut tops. Depending on where you work that might just be the men! In the winter people tend to wear more clothes, but even on cold days it's not uncommon to see someone who's chosen bare legs, or décolletage when others are bundled up from head to toe. In the warm weather people often have an even greater range of clothing choices. Some dress almost the same as they would in the cold weather, while others wear clothing that's very revealing. This doesn't even take into account situations where people might wear more clothes (downhill skiing) or less clothes (beach, night club).
So in everyday life there is no consensus on the "appropriate" way to dress for everyday circumstances. This is even more pronounced when people dress themselves for make-believe and fantasy. Halloween, Cosplay, Theatre and Movies shows a tremendous range in personal taste and expression in clothing. Even the same concept -- a warrior or witch -- can have some people choosing to dress themselves in heavy concealing clothes, or wearing the same amount of fabric they would at the beach, or in the bedroom. People will wear these costumes not just in private, but in public. One person might wear the heavy articulated metal armour of a late medieval knight to a convention, while another will elect to dress as a Spartan from the Movie 300. Different people have different ideas about what is appropriate, empowering, makes them feel confident, and is generally and awesome thing to wear.
There is no right or wrong choice here, and it extends not just to how real people choose to dress themselves but also to how imaginary people dress themselves as well. Everyone should have a choice about what makes them feel comfortable -- but also respect their ideas may not be shared by everyone else. When we make decisions about what is right or wrong to wear in a given situation and then make people feel bad for having different ideas that's a bad thing.
I feel strongly about giving people more choice about the media they want to create and enjoy, and find it troubling to see many people in "Geek" communities not understand that people may like things that they do not, and that they could find other things to enjoy rather than pressuring people to stop enjoying things that they are happy with. Making it more clear what sort of tastes and demographics media was created for seems like a better option than insisting that all media conform to our personal set of tastes and what we ourselves would choose as "appropriate" to wear in a given situation. People can then choose the media they like based on where they are in their life, their tastes, and even their mood at that specific moment.
If the issue is that you want to share media with your children, you want to select age appropriate media. If you are selecting media for Teens and older you need to recognize that people will have different ideas about what "appropriate" clothing is for various situations. You may prefer fantasy artwork with everyone in heavy armour while someone else may prefer it another way. Unless the discussion is about ratings and things like provocative clothing, suggestive themes, or sexual situations in media (aka "ratings") then the subjectivity of when something is appropriate to wear will always be that - entirely subjective.