I just posted this in the spoiler thread but i feel like it belongs here too.
I'm surprised not even Jim Sterling seems to understand this. It doesn't matter if you like the character, story and his/her design or not, in the end it's all about sales. How good this project sells, nothing else matters for those companies.
I think the reason why Quiet looks the way she looks is because of sales. Just look at it:
MGS3's The Boss - One of the best females in gaming, doesn't show much skin until the end > sales around 3.6M
MGS4's B&B Unit - more sexualized with skin thin outfits etc. > sales around 6M.
MGSV's Quiet - lots of boob shots, most skin a female MGS character has ever shown etc. > sales in the first few days already over 3M.
I really think Kojima and company thought about sales when they designed Quiet, maybe they blaimed MGS3's low sales (compared to other MGS games) on The Boss not showing enough skin.
I mean Kojima even says so himself.