The bottom line is, that each & every time I arise for the Amidah, I always close the button on my jacket, because there is considered Kovodik, so what better time to dress at the absolute most Kovodik, than when addressing the Ribbono Shel Olom. The Amidah is surely more important than for attending an interview.
Needless to say, I also close the button on my jacket for other very formal occasions, like lighting Chanukiyah, holding Arba Minim, arsing for the 10 commandments & the Shirah.
By Kiddush it doesn’t work out, as I have to sit down to drink the wine, and for Tekias Shofor this is a mute point, as I am wearing my Kittel.