Some do – Example Abercrombie and Fitch. They don’t have the inches (I don’t think) but they do come in long or short. But designers should have choices for most of the pants I find are WAY too long and I’m 5’3 – Average!! Us women should revolt! 🙂
There are acatually lots of places on the web with acutual inch measurements for long trousers: long tall sally or for short trousers: marisota.