You can iron on two transfers onto the same shirt or fabric. You will want to follow the instructions included in your package. The important thing to note is when you iron on the second transfer sheet that it does not come in contact with the first transfer.
Re-ironing a transfer will cause it to melt. Be sure that when you are ironing the second transfer that you avoid ironing over the first one.
You can find our fabric transfers here: https://www.avery.com/products/labels/usage/fabric-transfers
We also have helpful demos for our transfer products available here: https://www.avery.com/campaign/fabric-transfers?utm_source=vanity&utm_campaign=transfers