I picked up these old man trousers from the thrift store with a reconstruction project in mind. I cut the legs off, took in the waist band, and added some darts to get a fitted top.
Leaving the belt loops at the top definitely adds some extra cute power when a belt or ribbon is added. Leaving the waist tabs at the back allows for some size adjustment.
Taking in an existing waist band can be tricky with all that bulk.