I was surprised you needed a 15! I'm 5"2 and use a 17! It's actually dependant on your thigh measurement but a 17 should be fine.
I just sold a Stubben Lancelot on ebay for $400 that's a more expensive model but not in as good of shape. I'd sell this one for $350 to save me the hassle of posting it on ebay. Here are more pics. The shiny spots are from where the oil hadn't absorbed yet.