Mullin, who was presiding over the Senate while wearing his cowboy hat, posted a video on social media saying, "Nothing in the rules says I can't wear my hat to preside on the floor." However ...

From tropical getaways to ancient cities, these are the most stylish and versatile pieces to pack on your next vacation.

Never miss a story — sign up for PEOPLE's free daily newsletter ... complete with a Stetson cowboy hat. She rocked the iconic hatmaker's Shasta design in Mist Grey — which retails for $440 ...