Vintage T-Shirt Forum & Community Authentication Appraisals

Building up my Woodstock 69 and 99 collections. Was able to snag this on eBay recently. Seller was from Vermont, reached out for background yesterday but have not heard back. From initially looking at it, it seems legit. A little worn, no signs of being fake. Have been researching how to have it officially authenticated and it seems like there are little to no options for something like this but everything leads me back to this community. Would love to hear everyone out and hopefully be reassured that my assumption of this being legit is correct. THANK YOU!!!!!

This is authentic; in terms of the material and the print, it is exactly as it should be—there is nothing suspicious about it.