A seamstress's website that teaches the customer to measure the seam first
"Can it be let out?" is asked in an alterations workshop every day, and the answer is always the same: by exactly as much as the seam allowance holds, doubled — because there are two side seams. Usually that means three centimetres around, two in denim, and in overlocked jersey nothing at all. This site builds everything from that one number: it teaches how to measure the allowance at home in four steps with an ordinary ruler, then lets you check the verdict with a slider. The mechanism applies two entirely different rules depending on direction — letting out is limited by the fabric, taking in by the cut, and for shortening or a zip replacement the circumference is irrelevant, so the slider is greyed out rather than pretending to matter. There are three states, not two, because between yes and no lies a real band where the alteration is possible but dearer and visible; hiding it would be convenient and dishonest. The form goes one step further: if the customer supplies their own measured allowance, the server calculates from that figure rather than from a category average — their garment is truer than any table, and that is why the site teaches the measurement at all. The look comes from pattern paper: dashed lines, the same ones that mark a cutting line, frame the cards, the selectors and the verdict panel. The privacy policy carries a sentence found nowhere else: the workshop does not ask for body measurements and never will, because the calculator asks about a garment, not about a person.
