Depends on how badly u want to see Sepul I guess......

Mail it back to your home via snail mail

Aloha!

you don't necessarily need a heavy coat. A series of layers -- for example, a long-sleeve t-shirt, a lightweight sweater, and a vest (or a short-sleeve t-shirt) in addition to your lightweight rain jacket will do the trick. That's what we do in the Northeast for outdoow winter activities, and it allows you to take off/add a layer if you're too warm/cool. Plan well, and you'll be able to re-use all this stuff during your trip. You may also want a knit hat and some gloves.

We considered doing this and thought about sending winter clothing back by ups or FedEx. Contact a hotel in Seoul that you might stay at and ask if that is possible. Or you can leave winter clothes at first hotel in Thailand a d return there the last night to retrieve before returning home.

Take an old down jacket, then give it away. Or get one of the new lightweight ones, which take up hardly any room - I just saw this Patagonia knock-off at Costco in LA yesterday for $70. You will need a light fleece underneath.

You can also do the fleece/rain jacket method described above, adding a thin cashmere sweater. We've used that "system" for various 3-climate trips, including SE Asia and Japan.

go buy a really cheap jacket or even a 2nd hand one... should be tons of sales now...

Some of the polar tech fabrics can be folded and stuffed into a very small ...quart size...Baggie and the air squeezed out. A jacket of that, long sleeved shirt, vest of the same, and you should be good to go. Also a silk scarf at the neck will add to your feeling of warmth, and what could be more pack able?

I was thinking about this question while recently out for a half-hour walk in -10C temps in Ontario. Certainly I would want at least a knit hat (or headband to cover the ears) and gloves, as DT suggests. And heavier than average socks too. Beyond that a long sleeve shirt and polar fleece under the rain jacket (maybe with a vest) should work. Any way of layering the upper body should be OK; I'd be more concerned about keeping extremities warm.

We had a similar problem as we were going above the Arctic Circle in August and then heading to cities in Continental Europe, all with carry on luggage. We found the answer by buying a lighweight clingy Merino wool shirt made by Icebreaker. It kept us warm in the north as an underlayer and didn't take up too much room in our luggage. I found it in my local hiking store and they also have a website. www.icebreaker.com