4m x 3m Omlet pen, cube, new auto door still boxed and coop light

[jools+6]

tried this else where but no sucsess (?) my two big girls have fuzzy looking knickers strange sort of starey looking ... and they seem to be losing feathers on their usually plump looking thighs . they are a tight knit bunch and have never ever squabbled , even on day one they bunched up and cuddled in together . any suggeations . ? have spent the day gutting their house and powdering it etc same in garden where they freerange all day . they are laying well and gorging themselves rotten . combs and wattles bright red ... i am clueless as to what is wrong . however tikkas knickers looked this way about 3 weeks ago but were fine the next day and we put it down to wet soggy weather but she hadn't lost any feathers on her legs ... until now ....