She doesn't post often, but the-wind-and-the-sea is a fantastic cosplayer who dressed as Russia (I forgot what version. It was beautiful), and she's a grand total of 6'1" I believe. She did a GORGEOUS, most impressive Princess Kakyuu from Sailor Moon Sailor Stars last Kumoricon.
Height, while nice for cosplay, definitely isn't a necessity, so I don't worry about it. If I did, I wouldn't have cosplayed Super Sailor Moon who's 4'11". Lol!