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Is there a good guide anywhere for cross dressing size guide?
I'm about 6'4" 170lbs skinny, 32" waist and I was wondering generally what womens sizes I would need
There are a few crossdressing books that tackle this, because it largely depends on the brand you're buying. Women's clothing sizes are notoriously inconsistent.
A quick search for an online chart reveals Susan's Place has an interesting help:susans.org/reference/size.html
Size 12 should be your sweet spot, but everything is going to be too short.