Hi, Welcome the Forum. I’m going to copy your question to the How to Questions Forum. Have a look there for some answers to your question. I’ll title it Proportion Problem with Christmas Stocking.
I looked through the Christmas patterns at www.knittingpatterncentral.com , but couldn’t find a giant mitten.
What if you took the stitch numbers from a normal mitten and multiplied all of them by the same number? Had you tried that already?