Question in the title; I'm asking because one of my dreams is to pull off a floral suit or blazer, but I don't know what companies sell good quality, nor do I know how to style it. How would I do it?
It's kind of difficult because most floral blazers are really, really cheaply made, because they're fast fashion - intended to be worn all of about twice. They will usually have some sort of weird styling halfway between a sport coat and a dinner jacket.
There's a million things that define "made well" but I'd focus on ... probably three. I'm really spitballing here to take this with a huge grain of salt.
First, shell material. Most of these are the absolute cheapest material, ie, 100% polyester or similar. If you can find one made out of a good material, then you know someone actually put care into this and wants it to be at least seen as higher end. Often silk, or wool-silk blends, sometimes linen.
Second, a good quality jacket would match the intent. What I mean is this: a floral jacket is usually either deeply a "warm spring/summer" garment, or new-year's-eve-black-tie, so you'd expect it to be designed to match that need. For most of these, I'd expect it to be fairly light, less-structured, and to breathe well. If it's a dinner jacket, it should probably be the same, but might be on the opposite end. If you see a floral sport coat that runs hot, then the people making it probably didn't give a shit about how it was intended to be worn.
Third, detailing matching intent. See above, the part about weird dinner jacket / sport coat hybrids. You want it to be clearly one or the other. Either very clearly a dinner jacket, or very clearly a sport coat. Okay, I'll allow a jacquard ivory-adjacent jacket to be more of an "either" jacket, but mostly it should be clearly one or the other. That means matching details. True one-button vs two, having peaks/shawl vs notch (mostly), vented vs unvented, etc. You don't want an in-between-er.
Designer brands make these and slap very high price tags on them, but they're in ... honestly, very low demand, so a lot of them end up on ebay for pennies on the dollar. Something along the lines of: https://www.ebay.com/itm/175864074601
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