Yeshivish or Chasidish has little to do with appearances. One can wear a color button down shirt and be either Yeshivish or Chasidish or both. A Chosid might wear a suit, tie and “down” hat.
BTW, if Charda”l (CHAReidi DAti Le’mi) means “seriously religious” and “nationalistic Israeli”, by your very definition the “seriously religious” is coming from the chareidi description while the “nationalistic Israeli” is coming from the DAti Le’mi description. When did the term of Charda”l come into vogue? (I know the term Chareidi [at least in the U.S.] only came into vogue in the last 10 years or so. Prior, they were called “Ultra-Orthodox”.)