Hashem made two of ten commandments about worshipping other than Him. He also repeatedly, through prophets, warns that in the End Times this idol/god worship will still be going on. I don’t see any Israelites worshipping baal or asherah. However, I do see a MAN made thing that is being put before God EVERY SINGLE DAY. That is the law. God should come first! God Himself repeats this in the Tanakh over and over.
There are no hard and fast rules about white shirts. In general, a white shirt is considered to be a modest but respectable garment, and a person should wear clothing that is respectable.
Also, part of the day is spent standing in prayer in front of the Creator, and this certainly warrants respectable attire.
In any case, the main thing is not the external garments, but rather the spiritual ones, namely, a person’s thought, speech, and deed. Physical clothing is only a means to the end, the goal being purity of spiritual garments.
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