Most school crests were drawn for letterheads and signs: a shield, a charge or two, a banner and a Latin motto. On a blazer pocket that whole design has to work at around 60–80mm, in thread, on wool-blend cloth.
We triage the crest before building. Bold shapes stay, fine hatching and tiny charges are simplified, and the motto gets the most attention because it is the first thing to fill in. You see every simplification in the preview before you approve.
Crests stitched on jumpers and PE kit need their own builds, and sew-on blazer badges are a different file again: see sew-on blazer badges. Staff and office wear for the school uses the school logo on staff wear route.
Parents notice when the jumper crest doesn't match the blazer. We build each garment's version from the same reference so colours and proportions stay consistent.