I find these round-worked cardigans great, up until now I presented two crocheted round cardigans (see links below), now I found a sewn version which shows as well how to make it fit.
This looks as if it was very easy, too ;-)
Links:
Sewn Circular Vest (Circular Vest)
Here at unikatissima:
Round Crocheted Cardigan
Round Knitted/Crocheted Cardigans