Looks like the pants are just some leather pants kind of like these. With some extra stuff attached to the outside. The whole suit has a leathery look to it, unless anyone else can see anything I'm missing.
Will post scans of the side / back sketches tomorrow (back I had to guess for the thigh-mid back as I couldn't find any real reference)).
But I was thinking of taking an existing helmet to modify it to look like AntMan's like this helmet maybe since the part that would cover the mouth could hold the communicator thing. Plus it already has the eye holes setup. But I'm open for other ideas if anyone has any.
Just got a sewing machine a week or so ago, and got a bit distracted trying to finish off the captain america shield, so I need to loop back to this, but E3 is this week so I'm further distracted wandering around looking at the booths.