A device for altering the length of an undergarment band assembly includes an elongated body having a first band retaining loop arranged at a first end of the body, and a second band retaining loop arranged at a second end of the body. A first fastening element is arranged proximate the first end of the body and is configured to engage with a second band fastener of a second band of the undergarment band assembly. A second fastening element is arranged proximate the second end of the body and is configured to engage with a first band fastener of a first band of the undergarment band assembly.