I don't mind having blazers without matching separates*, because I like the slightly-different-but-not-too-much-so look, like a pinstriped black blazer over a grey skirt. (Yes, I do remember Babbitt complaining that wearing mismatched separates makes one look like a busted bookkeeper, or something, but his is not a mind that I particularly admire, anyway.) And pairing my grey striped blazer with a flame-orange circle skirt is one of my go-to favorites. (You may have noticed that my blazers and their accompaniments are not the most formal, but in my business casual workplace, I can get away with it.)
*My friend also points out that if you are in the habit of wearing matching suiting separates, well, separately, there is a risk that they will become ever-so-slightly mismatched. With some of her pantsuits, for example, the pants get so much more wear (and, by extension, dry-cleaning) than the jackets do. So they look a little more worn (e.g., faded color). It's probably not noticeable to most people, but still.
The most flattering blazers on me are:
It could be that cropped blazers on me hit where normal blazers would hit on normal women. (Zen koan, or a tongue-twister: Is a cropped blazer cropped when it's not that cropped on you?) Blazers this length somehow give the optical illusion of length to my woefully short legs & balance out my hips.
|Banana Republic swing blazer; sadly out-of-season.|
The "X" shape is famously flattering, per ExtraPetite and AlterationsNeeded. With high-waisted me, it's a struggle to find blazers where the X does hit at my actual waist, even in the petite section. I suppose it's just as well for my finances.
Blazers with ruchable/scrunchable sleeves:
It's probably a bit much for me to wear something like this from head-to-toe, but visually interesting tops are my best friend. The look can skew a bit evening-y, but if the rest of the outfit is low-key, I think they can work in the daytime.