First off, I'd like to say that I am confused as to how the pants and hair boom began on Miiverse. I made a related post for pants (and perhaps another one indirectly for hair), but they weren't motivated by this popularity. o.o
However, I REALLY do want pants and multiple hairstyles. Due to others' worries over pants and hairstyles affecting stats, I'd rather them be available in the Inkling changing screen and only be a cosmetic difference, but I still want them in.
Also, I personally think pants should've taken the place of shorts in the first place, if both could not be implemented (though I don't want pants to replace shorts, I'd want both so everyone has the option, and go ahead and add skirts for those who want them, too). Many people (myself included) find shorts with long-sleeved shirts a rather awkward look to the point that they would prefer not to wear such a combo, but pants are usually accepted with long-sleeves, short-sleeves, or sleeveless shirts. Since I usually wear long-sleeves, I have to resort to (admittedly cool) black or blue boots to conceal my legs, but even that's not enough. That's why I want mah pants. :P
Hairstyles should also be included, since Splatoon, aside from battle, also emphasizes customization, and being limited to one hairstyle per gender is a very limiting and ironic choice for a game with customization (especially for me T_T). It also looks weird seeing everyone just outright lacking a variety of hairstyles.
Lastly, I don't get why people are saying these potential additions don't deserve consideration to even be added in. It's true they could not impact anything at all gameplay-wise (and that may be for the best), but it's a nice cosmetic addition to players who like to have fun with customizing their looks (such as myself) while not harming the experience for anyone, and plenty of people ARE asking for it... :3