I think Jon's way off in left field for this one.
- no prehensile tail. These are not phanatons.
- leaving the yapping language, it fits their small size
- leave any draconic connections up to DMs/campaign worlds. Possibly mention it, but I'd like to see some variations as well, perhaps them being starspawn (The platapus of humanoids?) or a fiendish humanoid offshoot.
- They don't need to be great tailors or master smiths to make traps. These are entities that prefer to quickly cobble together traps rather than spend a lot of time fashioning quality items; their clothes are tacky, for example, because perhaps they divvy up the scraps of victims they slew with a scorpion-on-stick trap, instead of taking the time to build a loom...
I DON'T see an issue with clever trap-builders who don't make good clothes or accessories. What, just because I can build a car from scratch must mean that I also have lovely couture? It speaks to their psychology: they're not well-dressed not because they COULDN'T be, but because they don't value it. They value making blundering idiots impale themselves on nefariously designed traps.
Jon clarified in the article's comments that he didn't mean high cuture, but that he would like for the clothes to reflect the kobold's place in their society (a kobold who works with mechanical traps would dress differently than one who relies on living traps, like scorpions or spiders, for instance).
I never quite pictured kobolds as having that much of an organized society. I was generally under the impression that there was a leader...who led because he happened to be slightly smarter or stronger than everyone else. Beyond that I never really considered kobolds to have any further social organization.