For the Black Ice Advent Calendar: For them both, but Jack especially, it would be more for fashion than practicality as neither of them are uncomfortable in the cold, but one or both may like wearing their spiffy winter coats and whatnot and flaunting them about. Perhaps Pitch could even get Jack to wear some fuzzy boots or something of the sort just to see what he looks like with shoes on.
Fair warning to anyone who isn’t into it; I accidentally NDU-ed.
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When the weather is at its coldest, too cold for anyone to go outside unless they absolutely have to, Jack can’t help but feel oddly comforted. There’s something safe about having everyone inside and close by, and he feels less out of place when the others layer up for warmth. Once everyone else has resorted to wearing sweaters and layers, he doesn’t feel quite so much as if he’s hiding in his own clothes around them.
Piki keeps his outfits monochrome and close-fitting while Pitch refuses to wear anything remotely fluffy, but Proto and Pitchiner both take full advantage of the weather, Proto opting for bizarre colour and pattern combinations in his usual manner and occasionally breaking every rule known to man by wearing multiple scarves at the same time, while Pitchiner dips into his own collection of festive knitwear from his family.
Pitchiner wears cherubs and Rudolph and Santa with as much pride as he wears team jackets, and Jack can’t help giggling on occasion at some of the more extreme Christmas-wear, usually gets a laugh in response and occasionally a ruffling of his hair.
Winter clothing also brings an additional benefit for Jack, in that it makes everyone feel both safer and more comfortable to lean on. The bulk of the layers lets him lean on Piki without worrying about hurting him or being hurt by his sharp angles, makes up for one of the disadvantages of Piki’s lean physique, and with everyone else it allows Jack to cuddle up a little closer to them without the risk of bare skin brushing against bare skin.
Jack isn’t used to casual intimacy and doubts he ever will be, but it’s easier to practise friendly gestures when he isn’t afraid of overstepping the mark by accident.
There is one final benefit to the layers, one for behind closed doors and one that leaves him flustered without tipping him over into anxiety. Each layer Piki wears is one that Jack gets to watch him peel off.
Piki still comes before he does most of the time, but Jack is never quite as far behind him when it’s midwinter.