Bedwear (7)
(Other definitions for nightie that I've seen before include "Woman in bed in this" , "Lingerie item" , "Bedtime habit" , "Clothing worn in bed" , "one put on after dark" .)
(Other definitions for pyjamas that I've seen before include "Pays jam poorly to wear them" , "Nightwear" , "Bedclothes" , "Night attire" , "Sleeping attire" .)