adjective

similar in every detail; exactly alike.

four girls in identical green outfits

similar,alike,(exactly) the same,indistinguishable,uniform,twin,interchangeable,undifferentiated,homogeneous,of a piece,cut from the same cloth,corresponding,correspondent,commensurate,equivalent,matching,like,parallel,analogous,comparable,cognate,equal,like (two) peas in a pod,much of a muchness