Why not use old soda cans to make sequins? It’s quite easy to do with a hole puncher but they are then too tiny for me to work with. So I just cut up a can into little squares then rounded the edges with scissors. The aluminum can be pierced easily by a needle when sewing them onto a piece of fabric.
This “huipil” was made from a discarded black top. The ruffles are from a Valentino dress given to me by my friend Franky! And visible stitching (white on black!) was used to hem the edges.
Even clothes have to have names if you want to be friends with them so “soda can sequins” was embroideried on with yellow thread given to me by my mom years ago.