Reference garment
Choose a jacket whose present feel and intended layering you can describe. Record its condition and how you laid it out.
A jacket in a Kakobuy spreadsheet may list chest or sleeve measurements, but the labels alone do not make two numbers comparable. Match the measurement method to your reference garment before calculating the difference.
This worksheet compares one dimension at a time. It separates a flat garment measurement from a body measurement, preserves the endpoints, and shows the effect of uncertainty bounds you supply. It does not choose a size for you.
Keep notes clean
Choose a jacket whose present feel and intended layering you can describe. Record its condition and how you laid it out.
Keep the exact product option with the measurement source. A chart for another size or style is a different record.
Save the figure and unit before conversion so that rounding or a copied label can be checked later.
Write down any unknown endpoint, preparation step or uncertainty. The form should not make that question disappear.
Primary task
A familiar measurement label can conceal a different starting point or garment condition. If any condition is unknown, resolve it before treating the difference as a useful comparison.
Category prompts
These labels describe measurement methods, not an inventory of jackets. Select the method that the diagram or maker actually specifies; use an unknown state when the source does not explain it.
Quick FAQ
It only means that one measured dimension is larger under the stated method. Shoulder shape, armhole, length, material and intended layering remain separate questions.
The start may be a shoulder seam, a neck point or another landmark. Dropped shoulders can also change how a sleeve-only length relates to the whole arm. Read the diagram before subtracting.
Supporting guidance
Choose the same method for both records and confirm that both describe a flat, fastened garment. Enter the original measurement and its unit. The form converts inches to centimetres before subtracting the reference value from the candidate value.
An optional bound describes a plus-or-minus range you are prepared to use for that measurement. It is not a confidence level or a tolerance supplied by this site. When either bound is unknown, the form still displays the point difference but leaves the uncertainty range unavailable.
A positive difference means the candidate dimension is greater; a negative difference means it is smaller. The output concerns only the selected dimension. Do not interpret a numerical difference as a size recommendation or a prediction of comfort.
Supporting guidance
If the form rejects the comparison, find a source diagram or ask how the candidate was measured. A different method cannot be repaired by adding an arbitrary allowance. Remeasure your reference with the confirmed method if it is appropriate for its construction.
When the difference range includes zero, the bounds you entered allow the candidate to be smaller, equal or larger on that dimension. This does not prove that the garments are identical. It means that the chosen bounds do not establish a direction of difference.
A reusable note states the dimension, method, original values, converted difference and unresolved questions. That is more useful than saving a size label on its own.