Explain breeches to me
So, I've been riding for about a year now, and doing mostly English since April / May. I ride in whatever is comfortable and can get dirty -- like track pants or hemp/cotton pants in the summer, corduroys in the winter, and whatever shirt is comfortable. Dover had a sale so I just bought a pair of breeches. I don't get it. They are like a ponte knit pant, tight but stretchy, and thick. They are thick enough to no doubt be unbearably hot in the summer, and tight enough so that I think I'd quickly lose body heat if it were cold. They have a patch of fake suede in the inside knee.
My question is, aside from shows where there is a written dress code, why would I wear these things rather than comfortable pants? I mean, what is the point? This isn't a rhetorical question -- I am honestly wondering, am I missing something? If I don't ever want to show, is there any reason I would buy breeches rather than continuing to wear normal pants?
While I'm asking, when I look at breeches online I see there are different styles, like full seat. Anyone want to explain that to me?