Can i buy a Doctor skin before I buy the actual killer?

So I think the Doctor's Halloween event skin looks good and I'd like to buy it with the vials. I do not own Doctor yet, but I'm saving up the shards for him.
 I only have 7k yet and I'm afraid I won't make it to 9k until the event is over. Is it possible to buy the costume first and theb the killer?  

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