I believe a tam o'shanter is usually knit these days, whereas a glengarry or a balmoral or a caubeen, for that matter, is usually made out of wool. All the tam o'shanters I've seen have a large pom-pom on top, much larger than the toorie on a glengarry or balmoral.
I don't know, though. Maybe there's a tam expert out there. 
"To the make of a piper go seven years of his own learning, and seven generations before. At the end of his seven years one born to it will stand at the start of knowledge, and leaning a fond ear to the drone he may have parley with old folks of old affairs." - Neil Munro
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