Glasses on fabric

My friends and I are going to the carnival of Venice in February. So, we are very busy making our costumes. I suggested a light version of our usual complicated costumes, but my friend would hear none of it. Actually, she agreed, but along the way we lost that concept and she designed clothes that look simple, but are still time-consuming to make. But, it's going to be wonderful!
Here is something I saw while cutting the fabric for a vest. It's going to be worn over our corset and underneath our coat and it will have a woollen interlining. Venice in February is cold!