Join Date: May 2012
Although I have no experience with CDG, a few minutes of research can easily answer your question.
First, the seller on ebay has quite an amount of reputable feedback huh? Not always the case, people buy his/her stuff, think it's legit, then give them a good feedback based on price/authenticity.
I researched to see that the CDG white dot on black shirt (PLAY) is out of stock on the Dover Street Market site, the official retail site of CDG in EU. Since you are showing a Dutch ebay, one can assume you are in EU as well. If the official retail site's price is 110 euros and this guy on ebay is only selling it at more than 50% off? On a sold out item? Does it seem legit? of course not.
Then again, he does offer returns. You could always buy it and then return it if you check to see that it's not legit after all.