For women, the jackets to wear in spring, summer and/or fall are very divers. Different types, shapes, fabric and styles. For men, it is different. Nowadays, most of you do not own a summer jacket or anything that comes close to it. Blazers, sport jackets and even suit jackets are worn as such and therefor some of you might be a little confused. To avoid confusion between a blazer and a sport jacket, let me tell you the exact difference. After that, we’ll get back to the suit jackets.
A blazer was meant as a jacket, that didn’t need to match any trousers. A patch pocket, navy-blue jacket with either metallic (gold or sometimes silver) buttons often with a nautical touch. Think about older silver haired men messing around on their boats and you’ll get the idea. The blazer derives from the 19th century when the British Royal Navy changed their uniforms and has therefor a more formal uniformed look. Solid in colour and pattern (no pattern)
Can a blazer be worn as a summer jacket and on jeans, as you are dressing down? Yes, you sure can but I would recommend a sport jacket in that case and chino’s instead of jeans if you insist.
Sport jacket (sport coat)
This jacket is a good item to wear outside of the office and is often in different weights as it can be worn in spring/summer and fall/winter. The main difference to the blazer is that it looks less uniformed as it is, well… a SPORT jacket. Again, the 19th century meant that men would changes their coats and were looking for a more comfortable style to dress when outdoors. Sporty-like in a 19th century sense.
Patterned, in colour and with that casual twist. Softer construction, a generally softer shape and often with pockets with flaps, or an extra flapped ticket pocket. Can be worn on jeans, chino’s etc. Easy. Some of you might even go for bold colours and/or patterns.
I would not recommend it to be worn as “just a jacket to go outside”. The reason it is called a ‘suit jacket’ is because it comes with coordinating trousers. By wearing it as a regular jacket, you will shorten the life of your suit jacket and that means that it doesn’t look that good when you are fully dressed in your (three-piece) suit. Made out of finer, quality fabrics (worsted wool) and smooth at touch. You do not want it to get wet.
Just buy a nice (tailored) blazer if you like the formal look.
Of course, a tailored jacket (any of the three) is always your best option but any reasonable men’s store will have some finer jackets on display.