IS: I can’t argue about your rename, but you have to admit, he has a broad knowledge base.
I don’t remember everything he says, but I recall that ideally we should wear all white, just that only ba’alei madreigah can do that because for the rest of us it will cause gayva.
He brings two opinions on wearing all black and then a third that gives the dissenters reason for wearing black as a reason to wear it. Or something like that.
He also explains the minhag to always wear a jacket/rekel as well as the vest that some chassidim wear based on the machlokes of over or under the shirt.
I believe I’ve also seen either there or in another sefer the reason for tucking pants into socks.