Travelling from IndiaJapanese winters are much colder than most of India — Tokyo nights touch 1–2°C in January, so pack proper thermals and a padded jacket, not just a sweater. Kurtas with leggings or straight pants look elegant and fit the modest dress code well. Indian plugs (Type D) don't fit; bring a Type A adapter.
Travelling from the USSame plug shape as the US (Type A, 100V) — most phone and laptop chargers work as-is, but hair tools may run weak. Sizing runs small in Japanese stores, so bring what you need rather than planning to buy there, especially shoes above US 9 (men) / 7 (women).
Travelling from the UKYou'll need a Type A adapter (two flat pins). Summers are far hotter and more humid than a British summer — think linen, not jeans. Japanese stores size small, so bring essentials from home.