Maurice,
You will not be able to obtain a copy of the actual clothing receipt. It is stored in the National Archives in Washington. However, if you order the Compiled Military Service Record for the other man, J A White of Company B, 6th Alabama Cavalry, you will receive a copy of the single card where your ancestor's clothing receipt was noted, as that is where it is misfiled.
You should receive much more detailed information from his pension application. I would recommend ordering that. You will need to be clear when ordering that you are ordering the CMSR for one man, and the pension application for a separate individual with the same name. (Reference the pension number provided earlier.) Both records can be ordered from the link below, and by doing so you support these message boards.

http://history-sites.com/research/