A combination of ponte knit and another kind of poly knit (I think jet set?) since there wasn't enough of either in stock for me to use a single fabric and they were really close. I used one for the outer layer and one or the inner layer and cuffs; they were the same white and there wasn't a noticeable texture difference unless you looked really closely at the grain. I think the ponte knit was the one that stretched well in both directions.
On one hand I really like poly knits because they're thick and flow nicely while still having a little stretch to them, but on the other hand, they fray a lot and all polyester is horrible when it comes to keeping heat in. Between the two+ layers of poly knit and the polyester batting I used for the padding, it was really uncomfortably hot. It wasn't bad for Katsucon, but I wouldn't really want to wear it to a summer con.
Longest answer to a simple question ever.