For sure it greatly simplifies cosplay!
Dr Henry Jones Senior wears the same outfit the entire film, though in a possible nod to the femmes fatales of old he loses bits of clothing as the film goes on, first jacket, then waistcoat, then undone necktie, ending up with a partially unbuttoned (though bloody) shirt.
And the exiled Ser Barristan Selmy wears the same costume in every scene except for one change of shirt-colour.
And I believe my cosplays John Hammond and Allan Quatermain wear the same costume throughout (there's one scene where Quatermain comes in from the rain wearing hat and duster over his same costume).