I am 5'2" with a 28.5 to 29" inseam. I found that men's small tights often fit me just fine b/c men tend to have shorter legs for their height than women do (proportion-wise). So my warmest winter tights are men's Cannondale, size small. I got them for a very good price on the sale rack at Performance, because not many men wear a size small!
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow