As mentioned above, there are thousands of choices of fabrics in a variety of weights and weaves. Depending on your reason for purchase, your tailor should narrow the choice of fabric down to a few key choices through which they can guide you.
For suits and jackets, the most popular choices are wool—particularly for business suits— and cotton, while the likes of linen, cashmere, mohair and vicuna are even more luxurious options. We’ve written a comprehensive guide to cloth selection, should you wish to learn more.
Rather than simply bombarding you with information, your tailor will have gauged both how much you’d like to know about the fabric, and how much is worth your knowing, in your initial conversation. They’ll talk you through the qualities of each, share swatches and other sample garments with you to get a feel for each fabric, and allow you to make the best decision for you.