[quote="Phillip_Rolfes, post:11, topic:189706"]
In one word, "Latinization." Many Eastern Catholics (hierarchs included) think that in order to be truly Catholic they have to look and act as much like their Roman Catholic brethren as possible. :(
Seems to me that's a bit unfair. In so far as specific headwear is concerned, it is, AFIK, only the Syro-Malabars who ever adopted the Roman biretta (and, just like the Romans, they probably don't use it much any more either, but I digress). Syriac CC, e.g., bishops wear something that is rather like a short kamalavkion (without veil), not a biretta. And for all the accusations of latinization, the Maronites have always maintained the tobiyye (for secular clergy and bishops) and the eskeme (for monks and bishops).
Insofar as other dress, yes, in general most have adopted the Roman style, but normally with some specific modifications. The Maronites (in the Patriarchal Territories, at least), e.g., tend to wear a Roman-style cassock but the cut is subtly different, and so is the collar. Simple priests may wear a sash (like the fascia), and all who do tend to wear it well above the waist (even if they're not overweight!) I believe the custom among the Chaldeans is similar.