Use measurements for the brand you are ordering
Measure over the layer you will actually wear. Record chest and waist, plus inside leg for trousers. Use the size information for the chosen brand and style, since a medium can fit differently between ranges.
Check the complete outfit
Try reaching, bending and crouching. Jacket cuffs should stay in place without restricting movement, and trouser pockets should sit where they are usable. Check that layers do not cover reflective material or interfere with your other PPE. When ordering a team uniform, sample common sizes before placing the full order.
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