Ive tweeted @bitcoin for permission to use their bitcoin logo on a t-shirt. Waiting on a reply. If perhaps it was missed or something. Is there any other way to request permission from bitcoin.org?
It is great that you've ask first the management or the community before you used the logo of bitcoin in order for you to avoid copyright infringement just wait for further reply of the management before you used it.
It would be glad to know that some people are using bitcoin into a logo on t-shirt because if the T-shirt was done and many people buy and wore it then it would be a great strategies to attract people to go on the field of the cryptocurrency in order for them to know what cryptocurrency is and why many people are investing on it.
Maybe inform us if the T-shirt that you've doing is done and maybe our community will try to buy those T-shirt that you are designing.