TheBoyInTheDressisthestoryofDennis,a12year-oldboywholivesinanordinaryhouse,inanordinarystreet,inanordinarytown,buthefeelsdifferent.Hismumhasgoneoffwitharooferandheliveswithhisdad(SteveSpeirs)andbrother.Everythingisboringandgrey.Denniswantstoescapetosomesortofmagicalworld,anddiscoversitinthemostunexpectedplace-Raj‘snewsagent.AchanceviewofKateMossonthecoverofafashionmagazineintroducesDennistoawholenewworldofcolourandcreativity.ThankfullyhehasanallyinLisa,thecoolestgirlinschool,whodecidestoteachhimeverythingsheknowsabouttheworldoffashionandclothes.Dennisisenthralled,andafteralittlepersuasionfromLisatriesonadressshehascreated.SoontheydecidetotryandpassDennisoffas‘Denise’,Lisa‘sFrenchpenpal.Butcanaboywearadress,andwhatwillhisHeadmasterMrHawthornthinkifhefindsout-letaloneDennis’sdad,hisbestfriendDarveshandhisschoolfootballteam-mates?