“Would you appear before a Judge in Court on behalf of a client in jeans?
2. Would you appear before G-d in a Synagogue in jeans?
The truth counsel.”
I wouldn’t, myself, but if I were going to spend a day at the park with my kids, I would want them to be wearing comfortable clothing that was not likely to get ruined. I wouldn’t wear a ball gown to court or shul, either. Everything is about the appropriateness of the place, the time, and the circumstance.
I would also add, that I would not turn away someone who came into shul (not on Shabbos, however, with rare exception) to daven and was wearing jeans. It might not be the most bekovodik thing to wear (to say the least), but there could be a million reasons why someone showed up dressed like that,and to me the ikker is that he is davening in a minyan. I know from experience how easy it is to turn off a boy who is vacillating in his frumkeit, because he showed up to a minyan dressed in clothing that most of us would deem inappropriate for davening. We have done this thread already, and I see no purpose in rehashing it.