This is from the guidelines:
Each manufacturer is ultimately responsible for making a reasonable judgment about what information can be marked on their product and packaging, given the character and type of their product and packaging, and what required information can be ascertainable, given the character and type of their business.
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If, in your reasonable judgment, you can only fit certain information on your label without it interfering with the function or design of the product itself, I would think a web address, where the consumer could ascertain more details about the product, would be fine. You can fit even more comprehensive information on a website than you can on a small tag, so in my opinion, that's compliance.
Hula Moon, there are lots of etsy sellers who make and sell custom labels, or you can make and print your own fabric labels easily at home.