Shoes, trousers, jacket vest, shirt, tie... all of these items are important; Hats too, Yet none of those things are as important as the glasses you put on your face.
When I originally decided to wear the wire rimmed P3 style seen in the images below, I did so a bit out of fandom of the Indiana Jones look sported by Harrison Ford, and, a bit more out of the fact that I hadn't really seen a pair of glasses that just suited my own long oval face shape nearly as well.
The P3 style frame is a circle but with three points pushed out making in slightly triangular. The military actually started using shapes like this over the traditionally round frames issued to troops in the 1920s and 1930s due to the fact that the shape kept the lenses from spinning. If the wearer had a astigmatism correction, a correction that is meant to bend the light entering the eye so, the P3 was just better than a circle which unfortunately easliy allowed the lens to spin, nullifying the correction's effectiveness. But enough about the shape...
Hollywood keeps using the darn things over and over and over again. The particarlar go to brand is that from Berkshire Chase in London. A gold coated wire rimmed style with a brown mottled celluloid that circles the lenses and part of the arms.
It's just a quite accommodating style. Very timeless. I decided to go with them myself about 17 years ago when most people were wearing glasses that were rimless floating lenses with titanium arms. Glasses that were nearly invisible on the wearers face. I've grown up wearing glasses, they accentuated your identity, and to have something that was there and hiding yet not wasn't what I was into, so I went with the Beaufort P3 from Berkshire Chase particularly because they stood out at the time. Nowadays oddly enough my glasses look like background when seen around eyewear wearers with their thick black Zylonite frames.
That's all for now. Keep an eye out and you'll see these from scene to scene.