I took an XL men's shirt, put it on upside down (so the collar is in the small of my back and the hem is creating a collar around my neck), rolled the giant sleeves way up, and buttoned it asymmetrically across the front, then I belted it with the cummerbund.
I love the way this looks but it's not the best outfit in terms of arm freedom. My range of movement there is a bit limited, so this outfit may be only for events that don't involve much reaching and gesturing.
Outfit details:
Shirt and cummerbund: thrifted
Skirt, argyle tights, ankle boots, and necklace: Target