Just received 2 meters of this mesh material. Cost me £7.18 with p&p, although for you guys I'd assume the P7P is a bit higher. Looks as close as I think I can get it, but see what you can find when you search for 'sports mesh material.'
I also got some plain cheap black fabric at a local shop for the parts that won't be showing. I think the best 'stuffing' for the base of the vests is something like an exercise mat, or the camping mat as previously suggested. Anything light, but firm enough to keep it's shape.
As for the corduroy effect on the collar, a seamstress might be able to do 'ruching,' with some cheap leatherette type material. That's what I have in mind.
I've also ordered a car steering wheel cover off Ebay, which has the perforated material. Only £1.99 and free p&p from China, so I'll not get it until mid month and until then I won't know if it'll do the job, but it looks ok. Once I have all the parts, then I'll have a go at putting it together.
The links are;
Black Sportswear Mesh Lining
What Is Ruching?
New 14.5'' Comfortable DIY Car Steering Wheel Cover With Needles & Thread Black | eBay
Hope these are of some help.
H.