Orphans or sportcoat help
It's like, nearly always there's a little voice inside one's head, saying, "You know very well that this is an orphan suit coat." But one refuses to accept this obvious truth, and instead clings to a microscopic hope that maybe, just maybe, against all odds, someone online somewhere will opine that it might be a sportcoat.
And things aren't helped by the fact that a huge percentage of the "sportcoats" being sold as such on eBay are, in fact, orphan suit coats.
Just for my education, what makes them obviously orphans, especially the solid one?
Well, as some have said certain patterns and weaves are more closely associated with suits than with odd jackets, though there are national differences in exactly which these are. But mostly it’s not a question of your examples possessing suit-like characteristics as much as it’s a question of them not possessing odd jacket characteristics such as patch pockets.
Birdseye is more often associated with suiting. I don't want to come across as too dogmatic about this, though. The more you look at jackets and suits, the quicker you'll pick up on the differences. Some fabrics are much more likely to be associated with suits than odd jackets. Birdseye, nailhead, sharkskin tend to be suiting fabrics for example. Stripes (pinstripes, chalkstripes, etc) are almost always suits. Patch pockets are more likely to be associated with odd jackets. Metal buttons and mother-of-pearl buttons are more often found on jackets. Et cetera.