Start with your own measurements
Measure over light clothing and keep the tape level. Record chest, waist and hip circumference, plus the garment length you prefer. Recheck measurements when your usual fit changes.
Read the garment, not only the label
A letter size or shoe number is a starting point. Compare the measurements and intended shape of the exact item. For a relaxed jacket, leave room for the layer you plan to wear underneath; for shoes, check foot length and width together.
When information is missing
Do not guess from another MODUS item or from a different brand. Send us the item and your measurements, and ask for the missing dimension before deciding.