Now that i got your attention I will show you how!
things i used..
Breastfeeding cooler bag (sometimes they come as a gift from the hospital)
scissors, needle, thread, sewing machine, all that kind of stuff.
sillicone adhesive caulking.
marker
drill and small bit
nips for cutting heavy plastic
old cell phone holder with belt clip or anything like this.
All of that made my husband a beer cozy good for wearing on your belt in istuations where you have no cup holder.. like mowing the lawn … 
also this cozy will keep the beer cool and the sweat off the table.
here are the bag i used and the cell phone clip i used.
I started by cutting the plastic that is around the clip so i just had the clip .. i made sure there is enough parts of the plastic to drill holes to use it to attatch to the cozy.(hope that makes sense)
Here is what i have left.. you can file the edges down if you choose
Here is the part of the bag i am using .. it has a nice layer of insulation and a cool pattern for the cozy
Using the rigid bottom of the bag i cut a piece of the cardboard that is exactly the size of the base of a standard beer bottle and then glued some of the vinyl, with the sillicon, all around †he piece of cardboard to help make the cozy more rigid on the bottom.. after i gued mine i put it under my heavy candle to help it adhear.
Measuring the fabric around the bottle i pinned it and set it aside…
Using a small drill bit i drilled three holes (shown by arrows) in the clip so i can stitch it to the cozy.
Start by sewing half way up the cozy side inside out… cut a round piece to stitch to the bottom and attatch……you will probably have to do this by hand and make sure to double up (by folding) the bottom of the big piece of the fabric so that the raw edge is hidden and also it willl provide more support.
You can leave the top open but i found a pull close part on my bag that i attatched to the top of the cozy and stitched in place .. then turning inside out i finished it by sewingall the way up the side.
After finishing the seam then insert into the bottom the rigid cardboard circle to help the bottle sit on a table when in the cozy.. also stitch the belt clip by hand to the side of the cozy and there you go! functional beer cozy!
