Fluffy - I think the general rule is to be as tactful as you would be if you were speaking to someone in real life, so you're fine. 
I'm 5"10' and though I'm a size 10, I think it'd look slightly drag queen-ish on me, which is a shame, as I really like it. I love the Margot Leadbetter vibe it gives off though, yep, she would definitely wear it in a bright colour!