The easy way to get up in the morning and get ready for mainly music – with a mainly music FUN t-shirt. If it’s winter, wear a long sleeved layer underneath. Get your child into the mood of mainly music and prepare them for a time of interaction, education and connection with you.These are roomy shirts. The model is aged 2 1/2 and is wearing a size four shirt and it's got a lot of growing room. He previously tried on the size 2 and it still had room to move as well.