I run in a fleece jumper and fleece hat, even at this time of the year. I have nothing on the lower half.
No that's not right, I wear shorts.
So I run hot, I get hot and I sweat - alot. I am under the impression that this is making my metabolism run harder and so I am burning more fat. Because I once heard from a bloke down the pub called Dave, who owned a spitfire, (so it must be true) that Robbie Williams used to train in a sweat suit. Or am I completly bonkers?
I will add that for runs which are likely to go for more than an hour and a half I run in only a t-shirt, and if my run is greater than about 7km I run with water.
Today I even went out in an anorak!
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B3any_Boy
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I'd say all you are asking for is heat stroke. Wearing a sweater will do nothing more than to force the body to produce more sweat.
However, the main problem then is that the extra sweat won't be cooling you down efficiently- sweat is released to help lower the body temperature, so if there is a jumper in the way it's not going to be evaporating off the surface of your skin as efficiently. Your body will then sweat more to try and solve this problem, and you'll end up massively dehydrated with heat exhaustion.
Also, wearing a fleece hat will hinder heat leaving from the top of your head- now, I don't know about you, but I really wouldn't want to heat one of the most sensitive organs in my entire body up unnecessarily. Just remember, the scalp contains quite a few blood vessels and has evolved over the time to be an efficient heat exchange surface- putting a hat on the head when the body is already stressed from overheating is not going to do you any good. The body does not react kindly to even the slightest of temperature changes (as you can see if you get a fever of even a few degrees).
Now, if you were to do the opposite (run in winter in shorts plus a t-shirt) you'd lose more calories then due to shivering, but I'm afraid it doesn't work the other way around.
I'd agree with Greg, it's a touch on the bonkers side.
Anyone watch the Crime and Investigation channel? There's a programme called Strange and Unusual Deaths - and one story was about a high school wrestler who took this sort of thing to an extreme to loose weight so he wrestle in a lower weight class. The mistake he made, or actually his coach made (he was following his advice), was that although he was training in a sweat suit for 2 weeks, he wasn't replacing any fluids purposely. His blood therefore was starved of electrolytes and in my understanding of it this was why he died. Although he lost about a stone and a half, maybe more he needed to loose more than 2 stone to reach his target, but he died before he got there.
I would say your method isn't going to kill you and probably isn't going to help you lose weight because you are replacing your fluids (I hope) unlike the wrestler (and he was training for multiple hours a day), but be careful that you are replacing you electrolytes with a sports drink.
This isn't an answer to your question but one of my own as I'm so nosey. Is that Charlie Boorman punching you? if so, why? And if you are Charlie Boorman, why are you punching that poor man?
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Tips for running in hot weather?
W9R2 Sooooo hot 😓
Unusually Hot! 
Hot Hot Hot! Buster Poindexter (1987)
Consolidation run 5 - Urgh!
