I generally will wear only white shirts in the evening, although I'm trying to break the habit, and enjoy some pattern at night. I know that's a "Real Rule", but up in rural Canada, if you're wearing something other than a TapOut shirt, you're over-dressed anyhow. Only double cuffs with DB suits, although, again, I'm trying to wean myself off of this one. After getting called on not having any BD shirts in the Pattern mixing thread, I've ordered a couple, and I'll try them out, but, up until now, have never owned one. Also, I agree with a tie being required with a suit, but (semi-) optional with an odd jacket.