A couple of questions come to mind concerning what you wear and what theater your in.
Why are you asking about the AOT? Are you portraying a person from that army? Do you belong to a group that is portraying that army? Can you afford different clothing than you presently have? How many times a year will you be doing the AOT?
If your finances are like mine, wearing what you have will fit in most if not all mainstream events. If you are only going to do this once a year does the cost justify the expense? If you belong to a unit that does the AOT what are their reccommendations? If your doing this, most if not all year take a minute and buy the book that Ross reccomended( buy it anyway, it's well worth the price if for no other reason than referance, and a good read) and star from there. If your doing a more advanced event , or even a living history take the time to read the guidelines that may help you out a bit.
Clothing is only the tip of the iceburg:
what musket did they use?
Do they use tents?
blanket roll or napsack?
What was thier primary food?
What drill manual did they use?
If your not careful you can end up with a stack of books, printed loose leaf paper, a list of web sites a mile long. And most important of all a whole bunch of new friends who are either looking for the same info, or who can help guide you on your way.
Good Luck with your search!
Civil War Reenactor