I love the Anderson tartan too and have a kilt in the Anderson Modern tartan.
No doubt I may be corrected if I am wrong, but Clan Anderson has no recognised Chief so there is no authority needed to grant usage of the tartan.
A Society is not a Clan and whilst no doubt pleased that you asked, would not have any authority to refuse you.
Wear and enjoy it! 
[B][COLOR="Red"][SIZE="1"]Reverend Earl Trefor the Sublunary of Kesslington under Ox, Venerable Lord Trefor the Unhyphenated of Much Bottom, Sir Trefor the Corpulent of Leighton in the Bucket, Viscount Mcclef the Portable of Kirkby Overblow.
Cymru, Yr Alban, Iwerddon, Cernyw, Ynys Manau a Lydaw am byth! Yng Nghiltiau Ynghyd!
(Wales, Scotland, Ireland, Cornwall, Isle of Man and Brittany forever - united in the Kilts!)[/SIZE][/COLOR][/B]
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