These waistcoats are made from Polyester shower curtains, which is lightweight and copes well with getting slightly wet as the freezer packs defrost.
I made the striped version for myself last year when it was unusually hot here in the UK. I'm not used to the heat and wasn't coping well. I wanted a way to hold freezer packs near to me without damaging my skin, so came up with this simple waistcoat. Just add a freezer pack into each pocket.
After an hour or so the ice packs have defrosted, but it found it cooled me down enough that I was OK for a few hours before I needed to use the waistcoat again.
I used out-of-print New Look 6316 to get the shape for the front and back of my waistcoat (vest), but then cut a V neck.
It's closed with a strip of velcro at the front.
A friend who suffers from hot flushes asked for her own version, so I used a more fun flamingo shower curtain for hers and placed the pockets a bit lower down.