Cash Shop Outfits - What Do I Buy First?
There is no way to use the cash shop outside of the game. It has been suggested before but as far as I know there are no plans to add it any time soon, possibly not ever.
Out of the stuff you listed I’d recommend getting the bat wings first because they are the most likely to be a Halloween only item and so most likely to be removed soon (in just under 2 weeks time when Halloween ends).
The butterfly wings are new and not on a timer currently so they’ll probably stay for a while. I assume by fairy outfit you mean the daydreamer’s finery and that’s been in there for a long time and also doesn’t have a timer to say it’s being removed soon so I don’t think you need to worry.
They always give us notice when things are going to be removed, both on the website and by putting a timer on the item in the store which counts down to when it’ll be gone.
“Life’s a journey, not a destination.”