Frisk and Chara costumes #802357045, but I rarely see someone actually knit the sweaters so I'll share... : r/Undertale
Chara - Undertale Unisex Sweatshirt for Sale – httpkoopa
So, my irl name is Chara, and I call my future husband my Azzy. So of course Im gonna get us matching sweaters for our anniversary. We met because of Undertale. :