Some garment manufacturers have gotten hip and are now offering some of their styles with tear away labels. These labels generally get melted in the intense heat needed to cure the ink, but are easily torn out so that we can print your custom label inside.
In the event that we need to remove a sewn-in label, we resort to very sharp scissors and just snip the label off as close to the neck tape as possible. There may be some label residue left, but it is generally minor and unnoticeable to the typical consumer.
We may be able to arrange for a professional sew shop to remove manufacturer tags as well, although this is dependent on the order volume and garment brand. Let us know if you want to go this route.