1. “Hareidi” is relative. If there were no non-hareidi Jews, then no one would be considered hareidi. If everyone were hareidi, then no one is. The halachic interpretations and lifestyles of the hareidi Jews were “normal” until 300 years ago, when the non-hareidi (secular, haskalah, reform, zionist, etc.) movement began.
2. People frequently perceive past fashion erroneously. Indeed, only hard care “reinactors” try to get it right. It is quite normal that pictures of past events will dress them in anachronistic clothing – that’s normal in most cultures. It also tells the people to not worry about minor things like clothes, and look at the substance of what the people were doing.
3. Jews have always adopted technology from the goyim. In matters that don’t matter, we never worried about copying from the goyim. Note the lack of shailohs discussing such matters as use of shoes that distinguish right and left, using pens rather than quills, what type of underwear to use (which no one ever sees in public). Note that no one every asked about the switch from clay tablets to papyrus to parchment to rag paper to wood pulp paper (except for things that really matter, such as a Sefer Torah).
tiny edit (sorry for the nitpik)