As a suggestion, if you’re dead set at covering your car at work then get a custom car cover that fits snug where there’s ample elastic along the bottoms to keep it that way along with having the cover feature generous amount of fleece flannel lining to minimize abrading your paint. Use bungie cords where the tie down grommet holes are located to keep the cover from flapping against the cars’ finish because that’s where most of the rubbing damage will occur. If you’re willing to do whatever it takes to make your desire to cover your ride at work a happening, then spend whatever it takes to get the most protection for your paint finish. Friends of mine who build custom cars from the frame up and treat their rides as members of their family will spend over $500 for a car cover without hesitation.
Where I work, there’s a lot of epoxy spray painting going on and some folks who can only afford one car for themselves and their family will cover their cars because the company will not pay for repairing overspray damage on employee’s private vehicles. For me, I bought a very dependable easy to maintain clunker to take to work and will only take my beloved garage queen ‘Vette to work or to cruise nights to stretch its legs when the weather is ideal and will of course give it a good wipe down afterward.
You’d also have to consider what’s going to cost you to replace that car cover once it starts falling apart. Most car covers I’ve owned that I spent up to $200 on lasted a year or two before needing replacement, YMMV of course. The best bang for the buck I’ve gotten so far are seal skin covers. I buy’um on sale and they last minimum two years out in my driveway. The most I’ve paid are for covers made from Sunbrella fabric. It’s the same fabric that boat bimini tops are made of. I spent close to $600 bucks each including shipping for those.