About T-Shirt Design
A shirt does not need a giant explanation to be funny, and Moustache Smile T-Shirt proves that. Anyone who is into everyday humor will probably understand the idea right away.
You could wear it for casual days, bring it out for birthdays, or just keep it in the normal shirt rotation. It fits nicely with novelty t shirts that are meant to be fun first and serious never. People who buy t shirts for the joke as much as the shirt itself will probably get what this design is going for. The joke is quick, the message is clear, and that is really all it needs.