You're right that these are mostly different cases. However, the effect is the same isn't it? The result is someone who is dressed in a very sexy way that may cause people to notice them differently in the visual realm. The case for the videogames is that if men constantly see images of sexily dressed women it trains them to objectify women. The result is the same in real life if men constantly see women sexily dressed. That is Sarkeesian's argument anyways for why videogame fashion should change. As it's possible to see though, it does apply to real life in some way.
Women are saying: Don't objectify us and also "we dress this way because we like to dress this way". Ok, sure, but it's important to also know that men will visually see you as looking sexy.
It's a two-way street is what I'm trying to get at. Women want men to take women's reality into account. At the same time though, women should take men's reality into account. What I'm describing is respect. Yes, men should respect women's reality. At the same time though, women should respect men's reality. It's important to know how our sexes differ. Then, we can make more responsible decisions in regards to how we express ourselves and how we behave.
This ties into what @
botley writes in post #471. Men need to take into account a woman's reality. Vice versa.