alias: white kosode -> kosode

BUR #60869 is pending approval.

create alias white_kosode -> kosode

Kosodes are predominantly white; having an extra tag for an outfit's most common color seems unnecessary.

More like we only tag kosode on miko posts, which tend to be white.

I'm not sure we're even using the kosode tag correctly. We're using it mainly for the white kimono worn by miko, but I think in reality they weren't mainly worn by miko. As far as I can tell the main difference between a kosode and a kimono is that a kosode has a very wide body with short but wide sleeves (short in length, but with very wide openings) that are sewn-together at the sleeve cuffs. These things are not usually present in the posts it's tagged on.

Ref: topic #20873

BUR #60898 is pending approval.

create alias kosode -> kimono
create alias white_kosode -> white_kimono

Because the actual difference between the two is too small for tagging purposes, nobody on Danbooru even knows the difference and the tag is functionally just another way to search for miko, as I said in the previous thread on this topic. If you look at the posts currently tagged kosode it's mostly kimono anyway (the rest being literally anything worn by a character who is a miko).