As title states. Because every sweater_vest is a sweater cut as a vest.

That would just make every tag useless.

err...why?

Because there would be a huge amount of overlap, and you'd have to use exclusion to get what you really want, and lots of users can't do complex queries.

I think it would be more useful to define exactly what we want to call a vest and what we want to call a sweater (and maybe also what we want to call a sweater_vest), so that there's minimum overlap. The word vest itself is a mess due to conflicting usage between english varieties, but we can sort it out for danbooru.

Seems Shinjidude has already went ahead and started tagging many images sweater_vest, but it seems they were initially only tagged vest to begin with. That'd imo indicate already heavy overlap to begin with.

One could use Shinjidude's efforts to separate the two, since with his efforts you could now either make sweater_vest a subcategory of vest or completely separate the two by removing the vest tag from all those now tagged sweater_vest.

If we'd rather do that that's fine.

I expanded the pre-existing sweater_vest tag to include everything tagged as vest that fit (there were only a couple dozen to begin with). I suggested the implications to fit the preexisting reality that sweater vests are currently tagged only as vest (prior to my expanding the tag).

I don't see a sweater vest as a prototypical vest (though if I understand correctly that is the British usage). Only by tagging them correctly using the sweater_vest tag can you separate them from other vests even by exclusion.

If we'd rather separate the tags entirely (by removing vanilla vest from sweater_vest), that'd be perfectly fine by me too. I just thought it would be good to be able to query non sweater-vests, and without some sort of systematic way to separate them, you can't.

Yeah, sorry for being so curt with the first reply, I know you want to make things better for searching. But to avoid confusion, we first ne need to establish definitions for sweater, sleeveless_sweater (you forgot this one), vest and sweater_vest.
I think we also need to distinguish between the sleeveless things that open in the front and those that don't.

A sweater is a knit, sleeved shirt. A cardigan is a sweater that buttons down the front. A sweater vest is a cardigan without sleeves. Worn by girls, cute. Worn by men, instant gay. A sleeveless sweater is a sweater lacking sleeves. A vest isn't knit.

There, terms defined.

If that's the case then, most of what we have been calling vest, and what I tagged sweater_vest, should have been called sleeveless_sweater.

If that's the case, and we want to keep things seperate, we will need to unalias sleeveless_sweater from vest. I'd probably consider sweater_vest and sleeveless_sweater close enough to alias to each other though.

I'd argue against a sweater vest necessarily opening in the front. A quick google image search of "sweater vest" shows none with front openings) on the first page), but either way is fine with me.

I'd be careful not to tag everything vaguely looking like a sweater vest with a front opening as such though, since many of them are more more like plain dress vests, like those seen in Negima (much akin to blazers).

nil! said:
A sweater vest is a cardigan without sleeves. Worn by girls, cute. Worn by men, instant gay.

http://danbooru.me/post?tags=tieria_erde+sweater_vest&commit=Search

Odd, I should be getting hits...

Shinjidude said:
I'd be careful not to tag everything vaguely looking like a sweater vest with a front opening as such though, since many of them are more more like plain dress vests, like those seen in Negima (much akin to blazers).

I believe those would be appropriately called waistcoats.