Sizes can vary between brands and even within brands making it difficult to ensure an item will fit you correctly before ordering.
To help you we list all of our garments with the pit to pit size in inches next to the tagged size.
To find out your pit to pit (PTP) size dig through your wardrobe and find a similar item that fits you well, lay it flat on a flat surface and measure 1 inch under the armpit from one side to another and simply compare to our listings.
Other measurements which can be provided upon request are pit to cuff (PTC) and neck to hem length (NTH)
Pit to Pit (PTP) Measurement Guide
Pit to Cuff (PTC) Measurement Guide
Neck to Hem Length (NTH) Measurement Guide