Since it's a Guild Party, Outfits in Guild colours would be a neat touch. If you missed the Blue dresses and suits from the Lunar Festival or Love is in the Air events, some easy alternatives are -

Apprentice's Robe - Level 1 Human/Gnome Mage starting robe. Also available in Old Hillsbrad.
Recruit's Robe - Level 1 Draenei Mage Robe. Similar colour, different style.
or..
The ever popular Simple Dress - Made by any tailor character for a couple of Linen Cloth.

Birthday Post on the WoW Thunderhorn Forum too!

Happpy Birthday toooo usss!!

Happy Birthday , "The One"

Sonar

Happy birthday <The One>

sadly i won't be there as i gotta have lunch at the in laws this sunday

but i hope you all have fun and there is lots of naked Gnome dancing.....-> points at Giovou

have fun all.

Congratulations! Should have checked in on you a day sooner . Hope you had a good celebration.

-Hilbert

I am going to try as hard as possible to be there this afternoon but my computer (either hard drive or motherboard, not sure which) has had a complete meltdown so unless that gets fixed I am going to struggle.

Off to battle the evil PC elves.