It's a Women's SMALL size jersey made in the USA for TREK of a 100% Polyester fabric.
You can see it on our Sm\Medium half mannequin, and our best guess is that it won't be stretched by less than a 39 inch bust, but might be tight if you're larger than 41"
As the guys measure across the back, it's 19 inches, or 48 cm, from armpit to armpit. From the top of the collar, down the back to the tail below the middle (of 3) pockets it measures just over 23-1/2 inches, or 59.5 cm. It's 16 inches, or 41 across the back at the waist, or an unstreched 32 inches around. It's tapered to 35 inches around the hips.
TREK buys and sells a lot of cycling apparel, their own TREK & Bontrager private labels, and a few other brands.