Click HERE to see the "10 Customs you must know before going to Japan"
Click HERE to see Japanese How-to videos on just about everything

Clothing:  Groomed, tailored clothing is more acceptable than sloppy, casual attire.

Nail polish:  not as evident in Japan, particularly not dark colors

Perfume:  not commonly worn, including shower gels, etc., nor are homes sprayed with "scents" like in the US

Shoes:  considered very dirty to wear inside.  Always be prepared to take off shoes before entering a home or dwelling of any kind, and even bring your own socks to put on.