Aikido Shudokan (http://www.aikidoshudokan.com/
) is a fantastic dojo. I used to train there until I moved overseas but will train there again when I return. The instruction is of the highest standard and people are very relaxed and friendly. The mat space is not two basketball court's worth but it's large enough and very rarely is it tight for room.
Hakama are generally only worn on special occasions. Often, even the instructor doesn't wear one, so it's not really an issue of rank :-)