First time cosplayer, need some help

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92KB, 647x647px

So I'm going to AX in July and I'm putting together a bloodborne cosplay for it. Pic related but more black rather then brown and a sword instead of a scythe. I already have the coat for it and the hat is easy, all I need is a wide brimmed hat that I can fold into a tricorn. My hardest challenge so far is footwear, I'm trying to find a pair of knee/thigh high boots in my size, checked a few thrift stores in my area and so far ground nothing (did randomly find a flcl plush though, that was nice), my problems the size, I'm a guy and a size 13 so finding boots like the is a bit tricky, I was wondering if cgl had any tips for finding boots to use?