I'd say clothes, too - the shipment will take weeks, so one suitcase-worth each may not be enough.
I shipped one full container back from Japan (Allied Pickfords, they were fine), then also airfreighted some boxes of clothes, toys & kitchen basics as I was initially moving into a small rented place and wasn't sure how soon I'd be able to buy a house and get the rest out of storage. I got rid of all electricals and quite a bit of furniture before leaving Japan, but with hindsight I would have got rid of even more furniture - the low, modern furniture I had in Tokyo just did not work in the high-ceilinged Victorian house I have ended up in, and I got bookshelves built in rather than using the freestanding ones I had to have in rented places overseas.
Ikea and the supermarkets back in the UK are good and very cheap for household stuff (crockery, kitchenware, bed linen, towels etc as well as furniture) so if anything you're thinking of shipping back is old, scruffy or low quality, it's probably not worth paying the shipping costs. I also bought a lot of good quality antique/vintage furniture on EBay which fits much better into the Victorian house.
Things I am glad I shipped back are some bits and pieces of antique Japanese and Chinese furniture, artworks and a huge collection of blue & white and celadon china (some for everyday use, some for display), which make the house feel more like our old home.