I'd like to know of any good sniper gear mods that add good clothing for a BA sniper look. (Trenchcoat, etc).
Doesn't have to have good DR, just going for looks.

Personally i've just used the standard Wasteland Legend outfit already existing in the vanilla game for my sniper, but now i've switched to http://www.fallout3nexus.com/downloads/file.php?id=10183. It is quite heavy-looking combat gear, but great looking with switchable camourflage.

Ehh I'm looking for something a bit more lightweight. Not a big fan of combat armor.

I like Ranger Combat Armor, LeDoux's Hockey Mask, Lucky Shades, and Lucky 8 Ball. It all gives me about +30 AP and +2 Luck. Add Ol' Painless and The Reservist's Rifle and you're Mr. Deadly. They never know what hit them.

....This is the MODS section of the forums man. I know about all of those.

I don't know what trenchcoats have to do with snipers but have you tried http://www.fallout3nexus.com/downloads/file.php?id=10228 There quite a few trenchcoaty 13-year-old-boy-cool armours in there.