bias cut skirt

I am still having trouble cutting out a nice bias cut skirt. I am now going

to buy a pattern, anyone recommend a two piece (back and front) skirt 
pattern in a large size.
Basically I made my own pattern from my basic skirt pattern opening out 
folded piece into a front and back and marked a bias.  When I come to cut 
the fabric it has to be opened out and sometimes slewed around to get the 
fullness in even worse if it has a pattern or nap.  It is the second piece
I 
have trouble with, which way do I cut that. My friend who had a huge
sewing 
factory years ago says turn the second piece over but I can't see that is 
right.
Help please
Liz