according to 11-301, there's a document called Allowance Standard 016 which covers this. My google-foo is not working to find this AS, though links to plenty of other regs which mention it.
edit: AFI 65-601v1 says: "Refer to Allowance Standard (AS) 016 available through the the Air force Equipment Management System (AFEMS)."
edit 2, further reading in 65-601 (note that TA 016 became AS 016, but they missed updating this reference):
"10.55.7. Uniform Clothing Issued as Individual Equipment. Installations will use their organiza- tional O&M-type funds to obtain required special uniforms (e.g., desert BDUs, flight suits, and other TA 016 uniforms which are not included as regularly issued uniforms which are paid by individuals from clothing allowance), as directed by their commanders or other competent authority. These uniforms and the matching stripes and accouterments are “optional items directed wear.” The cost of any associated rank insignia, name tapes, and accouterments, as well as sewing on of these items on these uniforms, as required, may also be provided from organizational O&M-type funds at the discretion of the commander. This is applicable to officers and enlisted."