anything a non binary person does is not binary. showing of cleavage? non binary boobies. lots of make up? non binary beauty. dresses? non binary fancy. stop implying that people aren’t non binary because they won’t buy into the “androgynous masculine” bullshit. a non binary person who doesn’t hide their boobs isn’t mocking you. get over yourself.
Same goes for other body types and ASABs too. Beard and/or mustache? Nonbinary facial hair. Tons of body hair showing? Nonbinary fuzz. Showing off a very flat or concave chest? Nonbinary chest. Rockin’ a baggy t-shirt and cargo shorts? Nonbinary casual.
Nonbinary people don’t need either femmephobia or transmisogyny. Some nonbinary people get policed/erased in the ways detailed by the OP, and others (often AMAB) get their genders policed/erased because they “don’t look femme enough” to be “really nonbinary”.
Also, don’t forget that sometimes people of any gender identity dress a certain way because of sensory and disability reasons. For example, suits and pants may be uncomfortable to wear, so someone sticks to dresses and skirts. Disability intersects non-binary identities too, and I never see disabled non-binary people discussed.