Three moments, all of them ordinary, all of them where shops currently lose work.
The order taken while busy. Two customers waiting, a phone ringing, and an order that gets written on the back of something with the intention of entering it properly later. Later is when it goes wrong — the date is remembered differently, or the measurement is copied wrong, or the slip is never found. Speaking the order as it happens removes the gap in which all of that occurs.
The measurement taken with both hands busy. A tape in one hand and a phone in the other is the reason so many shops still keep a paper book. Saying the number instead of typing it is what makes a digital record practical at the moment of measuring rather than an hour afterwards. It goes into the same measurement record either way.
The question you never get round to asking. Which month was heaviest last year, which garment brings in the most, who has not been back. Not hard questions — just ones that need somebody to sit down with the books on a quiet afternoon, and quiet afternoons are the ones you go home early on.
All of it runs on the same account as the rest of the shop, on the phone as well as the desktop — see the tailor app. The tailoring stays entirely yours.