Most gradient legwear shifts from one color into white, black or a different hue of the same color, all of which would not count as multicolored clothes per the existing guidelines. Additionally, gradient can include monochrome images, whereas multicolored excludes those.
The wiki for gradient skirt put it nicely: This doesn't imply multicolored skirt due to null colors (white/grey/black) also being included as part of a gradient, which are excluded in the multicolored subsets.
I'm okay with the others, but the multicolored eyes tag is effectively a tag for sectoral (or "partial") heterochromia. The eyes of someone with sectoral heterochromia still have this condition even if one of the colours is black or grey or white (although in reality "white" eyes tend to be actually a pale blue). The heterochromia tag is reserved for cases of complete heterochromia, and its wiki specifically mentions that the multicolored eyes tag should be used for anyone with partial heterochromia. Anyone whose irises form a gradient by definition has sectoral heterochromia, so I would argue that the implication should remain.
I would also argue that there is no point making separate tags for sectoral heterochromia that happens to not include white/grey/black from one that includes all sectoral heterochromia, and that the latter of these should definitely exist as a tag.
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Having said that, I would also query the hair and wings ones - as far as I see it the "multicolored doesn't include null colours" is there to stop patterns that consist of one colour plus null colours that are commonly used on clothing from counting as multicolored. Such patterns are very common on clothing but extremely rare on hair (the wings tag is generally used for the fantasy sort so...), and I'd argue that most people would consider someone with hair that is partially black and partially a different colour to be in the same boat as hair that is partially brown and partially a different colour, in a way that they wouldn't with, say, a shirt.
The others are still up for discussion. My understanding of multicolored is that:
blue + yellow counts
blue + white or blue + black doesn't count
light blue + dark blue doesn't count
The last rule is only explicitly stated in multicolored clothes, but it seems to me it should apply everywhere. Therefore gradient shouldn't imply multicolored in general, because you can have single color gradients.
