Looks cool. I think you should wear it a lot.
It's weird, the older I get the less I care about materialistic things and the more I treasure emotional experiences. I'm not saying this to put any off on getting stuff signed and enjoying the hell out of it, do what makes you happy! However, I have a bunch of stuff signed by Dev and by other artists and such and I just don't....really care. I don't pull out signed stuff and look at it and think it's very neat. For me I'd trade it all to be able to sit down and share a cup of tea with Dev and talk to him for 5 minutes about music production. That's what ultimately tipped the scale for me with getting VIP tix on the next tour because the experience I had on the last one was so genuine and awesome it was impossible to resist repeating even if the cost was higher. Being able to just chat with the man and get his viewpoint on things is so so so much better than watching or reading an interview.
But yeah, like I said I don't say any of this to discourage collection or enjoyment. However, I believe that if Dev signs your shirt and you like that shirt and want to wear it, then wear it! What good are possessions we don't use? Keeping stuff mint in a box is just incomprehensible to me.