It sounds like matching costumes are for costumed events like Halloween or Christmas. Or for special pictures

There is nothing unusual about it. We go to this big Halloween event in our area and we love to see some very creative costumes that the whole family wears sometimes recreating scene from somewhere. It’s so cool! And how about whole family having matching Christmas pajamas. That’s very common in the US and pretty much is just fun.

Nothing abnormal about it. Lots of families do it. It’s not like he made to wear a dress to school because she wears a dress lol Matching holidays costumes is normal and just done for family fun as well as matching outfits for special pictures