Not what I wear today but UPS just knocked on the office door with a parcel.
Corneliani wool/cashmere. Navy, Flannel-like structure in a fishbone pattern (very subtle).
Fits like a glove IMHO. As good as it gets with RTW. And yes it covers my bottom.
Finally I have my perfect blue blazer! I am happier than the photo might suggest.
I got it here. Very fast shipping. Left Italy yesterday and I took delivery this morning. Thank you UPS. One IT48 and two IT50 left.