The first-century Roman Empire was quite different from our society. The church began as completely Jewish. Later it was a mix of Jews and converted idol worshippers. By the end of the first century it was mostly converted idol worshippers.
Poor people, by far, were the largest group in society. The middle class barely existed, and the rich were a small part of society.
There was enormous concern that Christianity (the church) not discriminate against the poor. The obstacles faced by the poor were enormous without enduring spiritual discrimination! James 2:1-9 declared Christian assemblies should make the poor feel welcomed and appreciated. Prosperous visitors were not to be favored. 1 Timothy 2:8-10 suggested prosperous Christians should not declare by dress or jewelry that godliness depended on what the person wore.
Remember there were no weekends then as today. Sunday likely began the work week in Jewish society, and probably was just another day for all non-Jewish people (the majority). That would mean Christians assembled early before work or late after work. The poor and the slave probably came to Christian assemblies in work clothes.
James 2:1-9 and 1 Timothy 2:8-10 often are used to suggest that todays Christian assemblies never be used to make the disadvantaged feel out of place or be used to display prosperity. Wearing work clothing shows no disrespect to God, but champions Gods values of not showing favoritism to prosperity at the expense of the disadvantaged.
Again, unity is not a matter of Christian agreement, but of Christian-to-Christian respect.
Link to other Writings of David Chadwell