Behold, the Trade Skill Sticky, up at the top, with an entire section on Tailoring! And it says...
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As to way to somewhat supply yourself, I'd take up Skinning as a secondary. That way you'll have leather for some bags which require it (for example, Runecloth bags need two Rugged Leather, so I save myself a bit by skinning my own kills).
Many people take up enchanting to supply items to disenchant, but enchanting has never been my cup of tea; so no comment here :-D. Basically, I suggest you supplement your income with hunting good items that sell well. Also keep in mind that as a Tailor, you will most likely not sell cloth, so that takes a decent chunk out of your income. Therefore, a gathering skill can be very beneficial to make up the loss.
In plain terms: skinning to supply yourself, enchanting to make yourself poor (unless you are already 60), or a gathering skill to supplement the loss of cloth.