We suggest using a preferred garment laid flat and referencing the below measuring guide.
Disclaimer: All measurements are approximate, and may vary up to 0.15 in / 0.38 cm
Waist: Bring the measuring tape across the front waistband.
Inseam: Bring the measuring tape from the crotch seam to the bottom of the leg.
Chest: Bring the measuring tape across the bottom of one armhole to the other.
Length: Bring the measuring tape from the highest point of the neckline to the bottom of the garment.
Shoulder Width: Bring the measuring tape to the backside of the garment and measure across both shoulders.