The measurement is obtained by laying the t-shirt (hoodie, shirt or other top) flat on a flat surface.
Tips on Sizing
Sizing Guide
How to Measure Chest Size
Body measurements A: NECK- measure at base of neck. B: CHEST
Chest Measurement half-chest and across-chest measurement
Sizing Charts and Sizing information –
How to Measure Chest Width? (With Pictures)
Size chart T-Shirts
Sizing – MALAIKARAISS
Size Guide Get It On Clothing
Measuring: Chest Size