An excellent cosplay tool!
When I’m figuring out a cosplay I’m usually sitting there literally measuring a picture on my computer screen and measuring myself and doing all the math. NO MORE!!!
This website let’s you upload a reference picture, set up a baseline (with something like your height) and then you just draw lines on the image and it’ll do the math proportionately so you know what measurements you need for your costume! There are instructions on how to use the site if you scroll down to the bottom of the page.