This Is The Most Expensive T-Shirt In The World!?

Superlative Luxury is selling what they claim is The Most Expensive T-Shirt In The World.
The a one-of-a-kind design is made from 100% renewable energy and comes hand-set with 16 diamonds: 8 1ct white and 8 1ct rare black diamonds.
So how much does this bad boy cost?
Only $400,000.
Thoughts???