Long sleeve shirt

1. Chest: 
Measure 2 inches below the armhole

2. Length: 
Measure from the highest point of the shoulder seam to bottom 

3. Sleeve Length: 
Measure from the shoulder joint seam to the edge of cuff.

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Trousers

1-Fit for waist

Measure waist laying the garment straight & relaxed

2-. Inseam
Measure inseam from your crotch to bottom.