Your Father Christmas outfit is simply unacceptable. 
I suppose it comes down to the question: at a Dickens event, is one going to make an attempt at dressing to period?
If "yes" then I'll put on my historian/re-enactor glasses (small oval steel-framed ones, of course) and expect things to be to period.
If "no" then it's simply a fancy-dress occasion. Anything goes, and I have no expectations as to historicity. Somebody could dress as Dr Who or a Jedi or whatever, it's all about having fun.
Let's for a moment make the (probably false) assumption that your aim is to dress in historically accurate costume. What is the period in question? If we're talking 1830s, say, none of the sporrans you're wearing existed at that time, save for the mid-18th century sporran which would already have been a museum-piece.
Proud Mountaineer from the Highlands of West Virginia; son of the Revolution and Civil War; first Europeans on the Guyandotte
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