Refrigerated Undershirt

I am rarely obliged to wear a suit in the normal course of my life and work. When I am obliged to dress more formally --- say, to a wedding on a brilliantly sunny June day --- I notice that the thing is MADE OF WOOL and that it's HOT. I propose a refrigerated undergarment. The undergarment would be a network of fine tubes that can be worn under the clothing, against the skin. A liquid with good heat-carrying capacity but low viscosity (so it can be pumped through the tiny tubes) will be pumped from a cooling pack on my belt, through the tiny tubes, and back to my belt. The tubes can either form the evaporator half of a conventional heat pump, or they can just carry my body heat to the cold side of e.g. a Peltier-effect cooler. Hopefully the other guests will be polite enough not to comment on the gurgling and/or whirring noises I make.

(There are few places on men's clothing with enough space to stash a bit of machinery. The belt, while traditional for gadgets, isn't really that good a place. Other possibilities include:
- in the soles of shoes. This means you will have to wear platform shoes with your suit.
- under your arm. People will wonder if you are an FBI agent with a shoulder holster.
- between your thighs. People will wonder why you are wearing a codpiece to a wedding.
- in a hat, with a quick-disconnect. You will have to disconnect the system when you go indoors, but hopefully the indoors will be air conditioned. Unfortunately the tube from the hat to the rest of the system will be visible.)