Priests and their clothing requirments

(Just gonna say sorry if this is in the wrong spot right now) So occasionally I will schedule a confession with my local priest. It takes place in his office and when I go there he’s usually just wearing a polo and dress pants or other typical work clothes. I didn’t think much about it at the time, but while on this form, I read that priests are required to wear the typical “Roman Collar” get-up when they’re out an about. So, is this true, or should my priest not be wearing polos (or at least not when he’s on church duty.)?

There’s an extraordinarily long discussion of this question here: forums.catholic.com/showthread.php?t=681683

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