Well, this one isn't a traditional astronaut, but it IS a very nice spacesuit. It might suit your needs... first go to

  
http://www.sixus1media.com/freebies.html    Scroll down a bit see all the freebies from Sixus1 Media. Go to the top set of freebies, and click on the right hand column, second from the top to download H.I.M.  Next scroll down and look on the lower right between the "Predator Pose Pack" and "Alley Cats for H.E.R. and you'll find a really nice model of a spacesuit. The suit has several different MAT poses, with differing colors, plus you could just go and change the colors of the textures yourself to get a more traditional looking white spacesuitif that's what you need. I'll vouch for the quality of these freebies.... although the basic H.I.M. figure looks a tad strange, the models of his outfits, costumes, etc overall are outstanding

Here's the link to my freebies:   https://www.renderosity.com/mod/freestuff/?uid=493127

My cousin Jack can speak to beans. That's right.... Jack and the beans talk