I'm 5'10 and think the 28 is ideal, actually, in Sellier. I do favor a formal traditional handbag look, though, so my sensibilities are influenced by that preference.
I say try one on-- I see no reason why it couldn't look very ladylike and elegant!
Lol I have a 25 and am 5ft 9 and think that it suits me fine although I use it mainly as an evening bag owing to its size. I also recently acquired the 35 and think they both look great with my height.
It looks good even on men and monkeys.