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The mistake is treating autumn dressing as "summer clothes but darker". You end up with the same thin shirt and chinos combo you wore in July, just in a browner colour, and you're freezing by the time you're two drinks in outside a pub. Autumn is about layers that actually do something, not a seasonal recolour of your existing outfit.
The whole point of this time of year is that one good jacket, jumper or coat has to work with almost everything else you own, so think about what's already hanging up before you buy anything new. A decent overshirt or a chunky knit should sit happily over a plain tee and under a coat, and go with the jeans and trousers you're already wearing, not demand a whole new outfit built around it. If a piece only works with one specific pair of trousers, it's not pulling its weight.
Colour wise, this is where autumn actually makes life easier. Browns, olives, rust, charcoal and deep navy all sit together without a second thought, which is more than you can say for the pale blues and brights of summer. A cheap version of these colours often comes out flat or slightly synthetic looking under daylight, almost orange where it should be rust, almost grey where it should be charcoal. A good one holds its colour properly and looks like it was dyed on purpose, not left out in the rain.
Before you buy, check the weight of the fabric with your hands, not your eyes, because photos make everything look thick and cosy. Look at the stitching on cuffs and hems, check whether a jacket has an actual lining or just a bit of branded tape, and if it's wool or a wool mix, check the care label before you fall in love with it. A jumper that says dry clean only in October is a jumper you will wear twice.
Fit matters more in layers than it does in a single shirt, because you're now fitting one thing over another. Buy outerwear with room for a jumper underneath without it looking like you've borrowed someone else's coat, but don't go so big that the shoulders droop past your own. Sleeves should let you push a cuff out without the whole jacket riding up, and jumpers should sit at the hip, not halfway down your thigh. The classic failure is buying knitwear a size up for comfort and ending up looking like you're wearing a blanket with armholes.
Let wool and knitwear dry flat, not on a hanger, or you'll spend November wondering why your jumper suddenly fits like it belongs to a much taller man.
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