I know Epaulet has a good reputation around here, but I thought I would add my 2 cents.
I recently bought the Hard Shawl Collar Cardigan: http://epauletnewyork.com/collections/shirts-knits/products/hardie-shawl-collar-cardigan-grey
I wore it for the first time today - went out to dinner. When I got home I noticed one of the buttons was quite loose. A slight tug and the 2-part button has come completely off - thread and all.
This now means I need to take it to the tailor to get the button put back on!
I think I will do this, because the cardigan is actually very nice. It regulates body temperature very well, which is probably attributable to the quality of material.
Anyway, off to the tailors!