Tink in 3 dimensions!
A thigh lift to some degree will affect the vertical, horizontal dimensions, as well as the "thickness" of the thigh. Depending on what exactly your physica findings and goals are, will determine the type of lift that is required. Many times, all that is needed is an incision placed in the groin-leg crease. If there is a lot of excess skin & fat, as well as loose supporting structures, then a vertical "inseam" incision will be needed. Usually liposuction is done at the same time, and if your skin and supporting deeper structures are good, this is a lesser procedure that you should consider first.
Web reference: http://mykasden.com/photos.cfm?id=30