The Second Task tee shirt is not made out of mesh, if it was it would be see through so I do think these are from the First Task Costume
I don't think the costume in the swatch is completely mesh either, as you can not see through them. I just think they have a mesh look to it. The first task costume mesh (as seen in the cards picture) IS see through. I think it might look meshy, but it is a solid material. I don't havw the yellow swatch to be sure, but if you watch the movie again, it makes sense since there is more yellow in that outfit than black.