The interesting origin:

Apelles of Kos, one of the famous painters of Ancient Greece, often brought his paintings to the village square to gain some real-time feedback. On one of these occasions, a shoemaker noted the sandals on a character in the painting and criticized their shape.

Apelles took note of the feedback and changed the painting. When he brought it back to the public square, the shoemaker then began to critique other aspects of the painting. To which Apelles replied, supra crepidam sutor iudicaret” , meaning “do not judge anything apart from the sandals".

Latin word ultra -beyond, and crepida -a sandal