These are the 70's triangle cut Halter Tops that will fit most body types. Please measure yourself to make sure these items will work out the way you are hoping.
Buy a good care book on your new gerbil and read it. Each small animal has it's own needs and they may be very different from many of the others you might know about.
Green Santa Inspired Hat w/Bell for Guinea Pig, Rabbit, Ferret, or Very Small Dog
In the high plains of South Dakota, USA