formal shirts

[Dukeof Kircaldy]

Coloured only if with an Argyll jacket and if its not a formal occassion. Actually, I should have qualified that: tweed Argyll=coloured and barathea Argyll=white.

The likelihood that a guest would be in a doublet is slim. So, the comment on frilly shirt, if you mean Jabot, was not what I meant. And, if a guest were required to wear a doublet, then a frilly, jabot shirt makes sense. But, the wearer would know that he was required to wear such a shirt.

If you are talking tasteless tux shirts: no reason for them under any circumstances.