Hananbd,
What I am saying is T's with a message, (TEXT) sell better than those that are image only.
I would imagine SOCCER MOM will have a ball graphic.
"My vote...." would do well with something patriotic, even if inverted.
"I'm with Stupid" accompanied by an arrow seems to be a favorite.
Now, call to action message should be TEXT ONLY, such as:
"Support your dog's right to vote!" or 'Shhh, text me instead."
As for what happens in the USA, I have no knowledge. However I can read what those who place their products on fulfillment websites say. I do not use fulfillment websites.
What I do know about my local area (this could prove really important to garment sellers) is when I send T down the running trail no less that 110 pairs if eyes see it and when it has a great hook, nearly 40% will visit the website. In the mentioned example I was helping grow a real estate business by offering a special house scoring service. The message was "I scored! You can to. Go to www.....xxxx..xxxx"
TEXT messages on T's are an undervalued marketing resource. Now would be a good time to consider collaboration with local merchants.
Take a moment and think how your great graphic creativity can run with a message like 'It's Just the CONSTITUTION!"
Now you must decide if your art is to provoke and stimulate or offer some peaceful affirmation.