I commented on many of your costume elements earlier, but I'll chime in at this late date to compliment you on the final look on the night. Yes, I think the waistcoat was a good choice, as it broke up the white of the shirt by adding some more darkness. The chains on the vest also fit the character.
No monocle on the night? Perhaps not the easiest accessory to wear all evening. Plus, if you had a monocle and a scarred eye, I might wonder what use you have for the goggles. Or maybe those are just to help your sentient hat to see better?
We know your gun was great, but I understand you had to set it down to get your drink on. I hope you stayed close to your weapon and remained vigilant though. You never know when a creature of the night might attack. You can't always count on your buddy Hellboy to save your butt.