That is a very interesting garment. It is not ostrich. From the photos, and without handling it, I would say it is a mix of 2 types of feathers. The more slender shinier feathers appear to be hackles, which are feathers from a rooster. The others look like a domestic fowl such as turkey, or perhaps duck or goose. They do look most like turkey to me.
Could you show us the reverse side of this? I am curious to see how it is made on the back. Also, how long/wide is it? I am not seeing Victorian in this, but perhaps it could be. I have never seen Victorians use these types of feathers in clothing, as a rule. They tended to use a more exotic feather or plume. But it could be a specialty item.