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This is the key point. If I know, you know, and JustFab know, then JustFab is without doubt acting in deceitful behavior. The act of deliberately portraying a subscription as an sale, usually comes down to the FTC (and sometimes State law) under the heading of False advertising.
Going to justfab website, nowhere on the front page or in the catalog does the word "subscription" become uttered. Not even in the linked checkout images is it mentioned. Justfab could argue that "everyone knows" that a VIP membership is the same as subscription, but it would be up to them to argue and prove that.
The front page especially could also be targeted, as it states clearly that 2 pairs goes for 39.95, and uses the word "buy" to describe it rather than subscribe.