I think it often depends on what type of business you work in as to what is deemed acceptable/inappropriate.
I generally take the view that "short" is higher than resting at the top of the knee cap when standing (on the theory that once you sit down it generally rides up a fair bit)... which is probably about the 2.5" someone else mentioned.
Low cut - I don't like seeing this in the office, particularly when colleagues lean over each other's desk (even if they don't intend to "give you an eyeful") and think it's unprofessional.
Sleeveless - I never used to really agree with this, until I moved to an aircon office which seems to be extremely warm all the time. I have now had to switch to sleeveless (generally with a high neck as that's my preference) but I work with my jacket on 95% of the time so most my colleagues aren't aware of this. I'm not keen on this, but when you're working in a warm environment you need to feel comfortable.
Shorts - I really don't think these are appropriate for an office environment. I don't actually remember seeing any of my colleagues wear shorts at any time (except for charity days where they pay a donation to wear specific items - eg jeans 4 genes).
I'm not sure office wear is about looking fashionable - it's more about what's appropriate to your line of work. Looking good is more about shape/style than length/fashion and if someone wears clothes tailored to their shape then the "fashion aspect" is irrelevant.
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