I personally wouldn't use the outdoor BMW cover, it's very light so if there is any wind it tends to buffet and it will leave marring / rub marks on the paint, unfortunately the BMW ones are not regarded to be much use unless it can be kept out of the wind.
I use a Classic Additions Ultimate Outdoor cover, it's 4 layer, fully breathable and waterproof, comes with three straps for securing the cover down, i've had mine a couple of years and being quite heavyweight it's very good for winter storage.
You know this already but never cover a dirty car, not unless you fancy machine polishing all the swirl marks out after!
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