If you are having difficulty creating clothing, there are a few things to look into.
Please note that your account must have a membership to upload and sell shirts or pants. While you can still create t-shirts without a form of membership, you will not be able to sell them.
Image Size and Format
All images that are uploaded will need to be either a .gif, .png, or .jpg file. Additionally, you need to make sure your image is the correct size. It is always important to use the appropriate template when creating your clothing, but occasionally the size of the image can shift by a pixel or two when editing or saving. If this happens it can give you an error telling you to be sure to use a template even if you already did. If this happens, ensure that your image is 585 pixels wide by 559 pixels high and try uploading again.