A Toronto summer does not arrive gently. It lands. One week the air is still cool enough for a jacket in the morning, and the next the city is sitting in the high twenties with the kind of humidity that makes the lake feel like it is in the room with you. The season is short, which is part of why it matters so much. There is not a lot of time to get it wrong. Tymeca Moy treats summer dressing as a problem of staying comfortable without giving up on looking like she made a decision, because the easy thing in heat is to stop deciding altogether and reach for whatever is loosest and least demanding. That is the trap, and it is avoidable.
The whole season comes down to fabric. In winter the question is warmth and in the transitional months it is range, but in summer it is breathability, full stop. A heavy, synthetic, tightly woven fabric will undo an otherwise good outfit the moment the temperature climbs, no matter how flattering it looked in the mirror in an air conditioned bedroom. She builds the summer wardrobe almost entirely out of natural fibres that let air move through them. Linen first, always, because it breathes better than almost anything and it has a relationship with wrinkles that she finds honest rather than sloppy. Then cotton, in its lighter weights, and the occasional piece of fine silk for evenings when the air finally cools.
Linen is the fabric most associated with the season, and for good reason, but it is worth being specific about why it works. It is loosely woven, so it moves air against the skin instead of trapping it. It dries quickly, which matters more than people admit on a humid day. And it ages in a way that flatters rather than degrades, softening with each wash. The trade is that it creases, and Tymeca Moy made her peace with that long ago. A linen shirt that has relaxed into a few soft folds across the day reads as lived in, not unkempt, provided the piece itself is good and the fit is right. Fighting the creasing is a losing battle. Choosing the fabric and then wearing it without apology is the only sensible approach.
Colour shifts in summer, though perhaps less than you would expect from someone who keeps a warm palette the rest of the year. The instinct in heat is to retreat into white and pale neutrals, and there is something to that, because lighter tones genuinely feel cooler and they reflect the strong summer light well. Tymeca Moy leans into the warm end of that range rather than the cold one. Cream, sand, a soft ochre, a faded terracotta. These read as summer without tipping into the clinical brightness of stark white, and they sit comfortably beside the deeper tones she does not entirely abandon. A rust linen shirt over white trousers is, to her eye, a more interesting summer outfit than the all-white version that gets photographed more often.
Silhouette is the other half of dressing for heat, and the principle is simple: let the air in. Anything that clings becomes uncomfortable the moment you start to move, so the summer wardrobe runs looser than the rest of the year. A relaxed trouser, a shirt with room through the body, a dress cut to skim rather than hold. This is the season where the bike-short-and-oversized-shirt formula she has written about elsewhere earns its place, because it covers what needs covering while leaving the legs free and the torso unrestricted. The looseness is deliberate, not careless. There is a difference between a garment with intentional ease built into its cut and one that is simply too big, and the eye can tell.
The complication that is specific to a city summer, and that catches people out every year, is the swing between outside and inside. The street is thirty degrees and the office, the streetcar, the restaurant, and the cinema are all aggressively air conditioned to something closer to eighteen. Dressing only for the heat leaves you cold for half the day. Tymeca Moy solves this the same way she solves the transitional seasons, with a single light layer that lives in her bag and comes out indoors. A linen overshirt, a fine cotton cardigan, something that weighs almost nothing and takes up no space but means she is never sitting through a long dinner with her arms crossed against the vents. It is the least glamorous part of the summer wardrobe and the part she would give up last.
The mistake she sees most, and the one she has made herself, is treating summer as the season that does not require any thought. The heat makes effort feel optional, and so the wardrobe quietly collapses into the same two crumpled things worn on a loop until September. But summer is brief here, and that is exactly the argument for paying attention to it rather than against it. A small number of good linen pieces, a palette that stays warm, a silhouette with room in it, and one light layer for the cold rooms will carry you through a Toronto July looking deliberate and feeling comfortable, which in this season are very nearly the same thing. That, in the end, is all Tymeca Moy is ever after.