Flat sketches
Front and back flat drawings with every seam, dart, gather and detail shown, plus close-ups of anything unusual: neckline finishes, sleeve heads, closures.
Measurement chart
Your base-size measurements with how each is taken (points of measure) and tolerances. Add grading for the full size range if you have it; if not, the factory can propose grading for your approval.
Bill of materials
Fabric (composition, weight, construction), lining, interfacing, thread, buttons, zips, elastic, labels and hangtags, with references or swatches for each.
Construction notes
Seam types, stitch density, hem finishes, how the lining attaches. If you are not sure, a reference garment communicates construction better than words.
Colourways, artwork and labelling
Pantone TCX references for each colourway, artwork files for prints and embroidery with placement, and label and packaging instructions.