Well, we're in the "I like Formal night" group. For longer trips, which is mostly all we do these days, Jerry brings not only his Tux with four or five different cumberbunds, ties or vests, but a dinner jacket as well, plus a suit-- and a sport coat which he wears on the plane. As for shoes, he just wears his boots with all of the above (you can do that when you're from Texas ;) ). Even with all of that, we've NEVER been overweight, so I'm wondering what we don't pack that everyone else does
My "formal" clothes are lighter than my regular clothes, so that's definitely not a problem for me. I wear black slacks with different sparkly tops on formal nights and the same black slacks with less "formal" tops the other nights.
And last, but not least, I think Ken always looks great no matter what the dress code!