When choosing a suit, fabric is one of the initial choices you will have to make. Depending on the season the suit fabric will differ.
Most modern suits are made of wool. It’s the most versatile fabric, the best in comfort, wrinkle-resistant, and has greater longevity than most. Another characteristic that makes wool an ideal suit fabric is its ability to absorb moisture, thus, even when you’re forced to sport a suit on the hottest of days, it’ll keep you cool. The most common types of wool suits are merino, cashmere and angora. Wool is a good year round fabric.
Flannel isn’t quite as popular as it used to be because it’s a heavy fabric that doesn’t breathe much, which means that you’ll be toasty warm in any climate. Its wear has also declined because the fabric begins to peel over time. Flannel is suggested for Winter or colder climates.
Cotton is a durable fabric found in most American men's suits; it doesn’t quite fit European's fancy. Like wool, cotton can absorb sweat (important for controlling body odor) and keep you cool throughout most months. As a huge bonus, the fabric is quite practical and easy to maintain since it’s machine-washable. Cotton is best worn during Spring, Summer or Fall Seasons
Linen may look cool while on a tropical vacation, but it has many drawbacks that don’t necessarily fit into the modern man’s day-to-day life. A linen suit is lightweight and will keep you very cool in the warmer months; but, its downfall is that it creases very easily. Best worn in Summer.
Polyester has a bit of a bad reputation, but current polyester fabrics have a reasonably nice feel. Its best property is that it’s strong and resistant to creasing, thus polyester garments keep their shape quite well. You’ll often find polyester blended with cotton to help the cotton keep its shape and prevent it from wrinkling (this is known as a ‘permanent press’ property).
Polyester is resilient and resists biological damage, it wears quite well and is easy to wash.
Viscose and Rayon are said to be the same thing. Viscose has a silky appearance and feel. It breathes like cotton and has a good drape. It is relatively light and found in lighter weight garments.
You will find garments that are fabricated in either one of these fabric types alone or as blends. For example 100% wool suits, trousers or sport coats. You can find suits of Polyester and viscose blends as well as 100% polyester garments or even polyester and wool blends. It depends on the type of fabrics you like, the purpose of the garments and your budget. Your retailer or tailor can and should assist you in your choice. The goal is to look and feel your best with your garment choice. While cost is a consideration you can look good with any garment you choose as long as it is fitted properly.