having made my son his weasley sweater from RH super saver:
1. it won't hold it's shape. it drapes.
2. it'll be too hot to wear most of the time. he wears his to school and then ends up taking it off because it's too hot.
3. it will end up having the weight of an afghan. my son sometimes wears his weasley sweater to bed with his pj bottoms and doesn't cover up. he said that wearing it is like being wrapped up in an afghan.
4. as mentioned above, it will melt. a couple small spots along the edge ended up with the yarn breaking. I used a lighter to melt them back together (these are places that are hidden in the seam). so not only does it melt, it also changes color (in this case from navy blue to a dark, burnt orange)
nada. taking a break.