UPDATE 2:
I am confused now.
http://lazyrose2007.blog115.fc2.com/blog-entry-12.html
But the entry does refer to the item.
The blogger says it is the M3 Vest, but the credits at this page say differently:
http://rosy-poison.sakura.ne.jp/poser/gallerypro/gallery.cgi?no=36

As for the actual download link - oh, boy, I have no clue.
This is turning into a real treasure hunt all right.

( The person who found the item says she took 2 hours to find the link - and she's Japanese, so she must have scrutinised the entire website  !! )

Eternal Hobbyist