I would go with sentimental items over clothing. Almost any basic need you will be able to purchase in-country, and it will help you to integrate with the locals. shop for the clothing they wear. Use the same hairdryer, etc. So as far as basics go, pack to get by for the training period- which is usually a lot less clothing then you think (or that I thought, rather)... then use the space for sentimental stuff... not only will it make the separation easier, but you will also have keepsakes from home to show the locals about your life and what is important to you.
I brought some cheap but sentimental jewelry, a nice coffee table book about the arizona trail (which I lived and worked on for two years), my chopsticks, and a tapestry I had hanging in my room for the past several years. Those things have stayed with me through peace corps, a year of studying abroad after peace corps, and now living in my host country permanently.