Fittings and On the button

On the button and fittings are semantically related. in appropriate topic. In some cases you can use "On the button" instead an adjective "Fittings".

On the button adjective - Being precise with regard to a prescribed or specified criterion.

Fittings and on the button are semantically related. Sometimes you can replace term "Fittings" with "On the button", this terms are similar.