# What is a BOM in apparel?

An apparel BOM lists the materials and trims in a garment, with references, placements and quantities.

*The list connects components to the garment. Material references, placements and quantities must be confirmed for the actual style.*

A BOM in apparel is the bill of materials: the list of every fabric, interlining, thread, button, zip and label needed for a garment, with placements and quantities. It tells the factory what each component is and where it belongs. It should distinguish a confirmed material from one that still needs approval.

The list is not just a record of what looks good together. A workroom and its suppliers use it to identify, source and allocate components. If one row is incomplete, they may have to ask a question or make a choice that changes the finished garment. Small trims can cause the same uncertainty as the main fabric.

## Make each component identifiable

Give each material a reference that stays consistent throughout the pack. A supplier code is useful when it identifies the exact approved item, but a code alone may not explain placement. Pair it with a clear description, relevant dimensions, colour and the part of the garment that uses it.

For a peplum shirt, the main fabric may serve the bodice, sleeves and gathered tiers. Interlining may apply only to specified collar, cuff or placket parts. Those placements should be explicit. A row called “interlining” does not tell a cutter which pieces need support or whether the full area is covered.

If two components look similar but have different functions, keep separate references. The thread used for a visible stitch may not be the same as the thread used elsewhere. A factory should not have to infer that distinction from a photograph of the sample.

## Describe fabric as a material, not a mood

Record the information that identifies the approved cloth, such as supplier reference, composition, construction, weight and usable width where relevant and confirmed. State the colour or colour reference clearly. “Light fabric” does not establish which cloth was approved, and a picture on a screen cannot confirm its handle or stretch.

A substitute fabric is a change to review, not an automatic equivalent. Different stretch, thickness or drape can affect fit, seam finish and consumption. If the chosen cloth is unavailable, ask for the proposed replacement and assess its consequences before treating the material row as resolved.

For sheer cloth, the appearance of internal components matters too. Interlining, thread and seam finishes can show through. The BOM should agree with the construction pages so the workroom does not buy a component that makes the approved finish impossible.

## Buttons need more than a name

A row that says “buttons” leaves the factory to choose size, colour, finish and sometimes shape. It also leaves open which button belongs to which colourway. A dark body may use a matching button while a pale body uses another reference. Record those combinations rather than assuming one row covers every option.

State the unit and quantity clearly. Count the buttons used at the placket and cuffs, and identify any spare separately if one is required. An illustration with four button symbols is not a reliable purchase instruction unless the accompanying list confirms that count and its basis.

The same principle applies to zips, snaps and other closures. Relevant length, type, finish and placement belong in the description. Do not add a zip row to a shirt that has no zip simply because it exists in the template. Delete irrelevant components so the list describes this style.

## Quantities need a stated basis

A quantity can mean pieces per garment, length per garment or an estimated material consumption. Name the unit and basis so the numbers cannot be read as an order total. A material row for one shirt is not the same as the purchasing quantity for the full production order.

Fabric consumption needs checking against the pattern, fabric width, cutting layout and size range. A preliminary estimate should be labelled as such. Do not present it as a confirmed cutting requirement before the necessary information exists. The factory can then review consumption without mistaking an early planning figure for an approved allowance.

Keep allowances, waste and any purchasing assumptions clear rather than hiding them inside an unexplained total. The purpose is not to prescribe one calculation to every supplier. It is to make the meaning of the figure visible to the person who has to use it.

## Labels are components with placement

A neck label, care label and size label can require different artwork, dimensions, folding and attachment. Give each one its own identity when those details differ. Link the material reference to the placement drawing and approved artwork, rather than expecting the BOM description to carry every instruction alone.

The BOM does not replace a check of required label content for the markets where the garment will be sold. It records the specified component and its relationship to the style. Content and legal requirements still need approval by the responsible people before the factory is instructed to print or sew labels.

## Connect materials to colourways and revisions

Each colourway should make the body fabric and changing trims unambiguous. Thread, buttons and labels can all vary with the main colour. A colourway chart can show the combinations, while the BOM provides the component references. The names on both pages should match exactly.

When a component changes, update the reference, affected colourways and revision record together. Tell the factory which version replaces the previous one. A message approving a different button is easy to lose if the attached pack still lists the old reference.

## Check the list against the approved garment

Follow the garment from collar to hem and account for every material that remains in it. Check support materials and concealed components as well as the visible ones. Then compare the list with the flats, construction notes and colourway pages. Missing rows and contradictory references should be resolved before purchasing.

For the surrounding layout, see [what a tech pack looks like](https://truile.com/guides/what-does-a-tech-pack-look-like.html). For the purpose of the whole set, read [what a tech pack is](https://truile.com/guides/what-is-a-tech-pack.html). A complete materials list belongs to that instruction, not to a separate collection of supplier notes.

If the material decisions for your garment need to become factory instructions, start with a brief for one style. The materials list belongs with its approved sample and technical pages.

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