Angus is a district tartan that's readily available from 2 different Scottish mills... it would not have to be a custom weave. You could pretty much order it from any kilt company that gets material from Scotland.

Here's a link to the different Angus tartans that are stock from different mills (note that some are 'ancient' and some are 'modern' color scheme).

http://www.usakilts.com/store/tartan...=show&gazgal=1