It is called Basket Weave/ Windowpane/ Latice Weave Sinamay. As you can imagine because of open weave it does not have strength of regular sinamay. Beware of cheap quality as you will need to pre-stiffen it yourself.
I would love to see a lesson about using transparent products like window pane sinamay or veiling to achieve this look. Is it principly the same as the crinolation techniques?