How does one understand their fashion type?

Not only related to clothes but also hairstyle and accessories, seems many people are aware of what suits them or what hairstyle they should go for.

Same with clothes, seems people are aware of what would suit them and their aesthetic sense.

So without really spending much(like a trial and error), how does one know what they should go for. Personally, don't really have good fashion sense, but i do really love seeing different aesthetics regarding fashion which might not actually suit me haha.