the airconned clothes are back and have been subjected to some modifications. No more DIY-style of the first version, this product has really developped in a substantial manner.
You can find a version with long sleeves or a short-sleeved shirt, in different sizes and colours. But the most effort was put underneath the clothes, the fan/batteries-system has been reviewed big time.

Weight of the two fans and the battery pack: 650gr
Weight of the shirt with the fan but without the battery pack: 550gr
100% cotton or 100% polyester depending on the model
Batteries: 4 AA batteries

Long sleeves
Result of the A/C: 500 kilocalories (per 33eC); 860cc/hour
Electrical consumption: 2.5w
Battery life: 5 hours with Sanyo 2500mcAh nickel hydrogen rechargeable batteries

Short sleeves
Airflow: 20 litres/sec maxi; 12 litres/sec mini
Battery life: 5 hours with Sanyo 2500mcAh nickel hydrogen rechargeable batteries