Use a sewing kit's soft tape for accurate measurements, avoiding metal tapes or yard sticks to prevent inaccuracies.
UNISEX SIZE GUIDE

HOW WE MEASURE A JERSEY
Laying the garment flat, gently
smooth out the wrinkles without
stretching the fabric
1. Chest Width

Measuring the width of the garment front
from about 2cm (1 inch) below the underarm

2. Length

Measuring the length of the garment front
from the top of the shoulder seam to the bottom hem