My bedroom window seat is my favorite spot in the house from October through March. It is where I drink my morning tea and watch the leaves fall. A few cozy layers turn it from a plain bench into a retreat. Here is exactly how I style mine.
1. Start with pillows in fall tones
Pillows do most of the work. I use three or four in rust, mustard, cream, and a deep green. Mixing textures matters more than matching colors. A knit pillow next to a smooth linen one looks collected instead of staged. I lean the biggest pillows against the window and layer smaller ones in front. When the pillows look inviting, the whole seat works.

2. Drape a chunky knit throw
A thick knit throw folded over one corner of the seat says cozy instantly. I pick one in cream or oatmeal so it goes with everything. The key is making it look casual, not folded like a store display. I just toss it and adjust the corners a little. When I actually sit there, the throw is already waiting for me.

3. Add a lumbar pillow for your back
Window seats look pretty but sitting on them can hurt your back. A lumbar pillow fixed that for me. I rest it against the window frame where my lower back lands. It makes reading there for an hour actually comfortable. Pick one in a pattern you love since it sits front and center. Mine has a simple plaid that fits the season.
4. Set a lantern or lamp nearby
Good light makes the seat usable after dark. I keep a small lantern on the sill or a floor lamp pulled close. Warm light is the whole point, so I avoid anything bright white. In the evening I light the lantern and the corner glows. It becomes the coziest reading spot in the house once the sun goes down.

5. Keep a basket of extra blankets
One throw is decor, but a basket of blankets is an invitation. I keep a woven basket beside the seat with two extra blankets rolled inside. When my husband or kids join me, nobody fights over the one throw. The basket also fills an awkward empty corner. Rolled blankets look tidy and feel generous.
6. Style the sill with candles and pinecones
The windowsill above the seat is free decorating space. I line mine with a few candles, some pinecones I collected on a walk, and a small pumpkin. It frames the view beautifully. Keeping the sill simple matters because the seat itself is already busy. Three or four items is plenty.
7. Add a small table for your tea
Every reading spot needs a place for a mug. I pulled a small wooden stool next to my window seat and it works perfectly as a side table. It holds my tea, my book, and my reading glasses. Without it, I was balancing my mug on the seat and spilling things. A tiny table makes the whole setup feel finished.
8. Hang a soft sheer panel
A sheer curtain panel on the window softens the light and adds privacy. I hung one panel on a tension rod and it took five minutes. The light coming through in the morning is gorgeous, all diffused and golden. It also makes the seat feel like its own little room. In winter it adds a layer of warmth too.
9. Bring in a fall scent
Scent is the invisible part of cozy. I keep a cinnamon or clove candle on the side table, or a small bowl of dried orange slices. When I sit down with my tea, the whole corner smells like fall. It sounds like a small thing, but it changes how the space feels. Our brains link scent to comfort fast.
10. Do a nightly two-minute reset
A window seat collects clutter fast. Books, mugs, phone chargers, the mail I was reading. Every night I spend two minutes putting everything back. Pillows get fluffed, the throw gets folded, mugs go to the kitchen. Waking up to a tidy seat means I actually use it. A messy one just becomes another chair I avoid.
Conclusion
A fall window seat is really just pillows, a throw, warm light, and a place for your tea. Layer those pieces and give it a nightly reset. You will wonder how you ever lived without your little corner.