The shalwar doesn't make you feel bloated after a big meal, unlike trousers do. It must be awesome from women, they can wear khameez shalwars at most events.
solution to this dilemma, expanding waistband trousers.
that may lead to other problems like becoming a social outcast
but atleast no regrets after downinf some chargha and nihari :D
although they do make trousers with tabs which can be loosened or tightened, its a relic of the past or available on bespoke stuff, which can be another solution.