I got out of the Army in 2010. Am I still authorized to wear military uniform, specifically my Class As?

Why would you want to wear your class A’s after getting kicked out of the army?

Federal law by way of AR 670-1:
21–4. Former members of the Army
a. Unless qualified under another provision of this regulation, or under the provisions of 10 USC 772, former members of the Army may only wear the uniform if they served honorably during a declared or undeclared war, and if their most recent service was terminated under honorable conditions. Personnel who qualify under these conditions will wear the Army uniform in the highest grade they held during such war service, in accordance with 10 USC 772.
b. When authorized, the uniform may be worn only for the following ceremonial occasions and when traveling to and from the event and must follow guidance included in paragraph 3–7c.
(1) When attending military funerals, memorial services, weddings, inaugurals, and other occasions of ceremony.
(2) When attending parades on national or state holidays, or other patriotic parades or ceremonies in which any Ac- tive or Reserve U.S. military unit is taking part. Uniforms for these occasions are restricted to service and dress uni- forms; the combat uniform and physical fitness uniforms will not be worn. Wearing the Army uniform at any other time, or for any other purpose than stated above, is prohibited.

How worn:
21–1. Occasions of ceremony
a. As used in this regulation, the phrase “occasions of ceremony” means occasions essentially of a military character, at which the uniform is more appropriate than civilian clothing. These functions include, but are not limited to, military balls, military parades, weddings, military funerals, memorial services, meetings, conferences, or similar functions of as- sociations formed for military purposes, of which the membership is composed largely or entirely of current or honorably discharged veterans of the Armed Forces of the United States. Authority to wear the uniform includes wear while traveling to and from the ceremony or function, provided the travel in uniform can be completed on the day of the ceremony or function and must follow guidance included in paragraph 3–7c.
b. All persons wearing the Army uniform will wear awards, decorations, and insignia in the same manner as prescribed in this regulation for active duty Soldiers. For civilian attire, individuals may wear only those awards, decorations, or insignia authorized by this regulation for wear on civilian clothing, in the same manner and approximate location as the equivalent military uniform.

Go for it, who's going to tell you that you can't? This is America, and as long as you aren't benefiting from things that you didn't earn, you can wear whatever you want, whenever you want. They can't kick you out of the Army twice.