I started out using a plain brown english bridle, I didn't get any comments. But when you hit Congress, you will notice that everyone has the traditional mare bridles.
You can get them from Kennedy Harness, Lutke's (although both are way backed up), minitack.com, just for ponies.com, national bridle.com, Herron Stables (herronstables.com), and world championship.com., and finally walsh harness. I sell the Walsh harness. But they are only red and black in the brow band.
Everyone shows with a brass brow band, which I don't understand, but will abide by. I have yet to run down the rule that states it is to be just brass.
There are the mare and stallion bridles, both take bits. And then there is the mare halter, which has not bit. I use the mare halter as much as the mare bridle.
Hope this helps.