WELCOME ARIEL!!!
I have the same bike and in a 47 as well. I'm glad you love it as much as I do!!! It's a great ride.
As everyone has said, you gotta go au naturel. I was squemish about it and went out for my first ride with undies on. I spent most of my ride pinching and fixing my shorts and learned pretty quickly to not wear them again.
As for sports bras, I really like the Champion sports bras that actually...lift up the girls...it's got great support for my running but at the same time still makes me look like a girl...
Enjoy the ride and let us know how you progress!!!
All limits are self imposed - Icarus