Isaia Group have two factories:
One in Casalnuovo (Naples) that produces only Isaia garments (no private labeling afaik)
Another one -Michelangelo Spa- in Frosinone (near Rome) that used to produce three brands: Michelangelo, Eidos, Sartoria Correale plus private labeling.
Their jackets could be from completely unstructured to fused (very good fusing) or half canvassed depending on brand or requests.
Always very high quality, nice cut and fabric in my experience, but...