Get a roll of pallet wrap. Wrap the whole pin with the head down legs on. Take off legs. Load it up.
Done, and done.

$20 a roll or $80 for a box of 4. 1500 ft per roll. One roll has lasted me 6 pins and there is probably enough left for more.

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My mistake didn't realize you just wanted a super quick cover. You could just got to the dollar store. Pick up some shower curtains and duct tape. And make your own custom cover for a few bucks.

Could be a fun project. If you have the time.

If not, that loveseat cover looks like a great solution.