Reading a clothing size chart with a screen reader
When the chart is a real table. Jump to it with your screen reader's table command (T in NVDA and JAWS browse mode, or the rotor's Tables option in VoiceOver). Move across a row to read one size's measurements, and down a column to compare one measurement across sizes. Listen for the column header so you know whether you're hearing chest, waist or length.
Body chart or garment chart? This matters more than most stores explain. A body chart gives the body the size is meant for ("fits chest 38 to 40 inches"). A garment chart gives the clothing itself ("chest measures 42 inches around"). Compare a body chart with your body measurements, and a garment chart with a piece of clothing you already own that fits.
When the chart is a picture. Your screen reader will skip it or read a file name. An image description app can read the numbers aloud, but check the column headers carefully. Some stores also list measurements in the product details lower on the page.
Units. Watch for centimeters versus inches, and for "half chest" measurements (across the front only), which are half the full chest.
Or skip the arithmetic. Dress Aloud reads the size chart from the page, compares it with the height, weight and measurements you saved once, and tells you which size to pick and why. If the store gave no chart, it tells you that too.