In reply to midweekjolly2:
I am 32" waist and 33" inside leg and I have medium long Cascadas which fit nicely so +1 on the shout above.
That said, they only have a single flap behind the leg zips so in strong wind rain gets blown through the zips and my legs get wet. Needs pretty severe weather to do it mind.
I use the aspira trousers in medium long and they are the business in winter. Mine were dirt cheap off here and riddled with crampon hole repairs. Still keep weather out perfectly and I'm not precious using them.