Might be worth checking out the sole nail pattern thread to work out who makes the Canali shoes.
Also, I don't know if this applies to hankies since I don't wear them, with silk ties it is usually pretty easy to tell poly from silk for me.
Normally, silk ties of the same size should feel a bit heavier than the poly ones. On touch they have a drier crispier feel. Scrunching knit ties up should feel a bit crunchy. Similarly rubbing two pieces of silk together would give a fairly distinct, for lack of better word, 'squeakiness' that you don't get with poly fabric.