Originally Posted by bespoke couture
Fused collars and cuffs are not the way to go if you are paying serious money for your shirts. You will get a stiffer collar and cuff by going the fused route, but the shirt won't last, especially if you get the shirt starched. The better shirt makers such as Turnbull & Asser(and of course my shirts)are never fused. Ultimately it's up to you go with fusing, the same way way it's a decision to go with fused suits vs. all handmade canvas suits. If you want to really get your dollar's worth and have something that can stand the test of time(8 to 10 years if cared for properly)go with the non-fusible collar, often called swiss interlinings. They are sewn down similar to the way canvas in sewn down on suits. You should be able to take a collar and cuff and rub the fabric between your fingers. The fabric should sort of pull away not stay glued(fused)to one side.
A number of bespoke and high-end makers, including our esteemed Mr. Kabbaz, use fusing (not exclusively, but certainly commonly).
EDIT: Ah, I see I was beaten to the punch.