着替え

1. Origins, structure, and basic meaning

• Structure: The written form is 着替え, read きがえ. This noun can denote either the act of changing clothes or the clothes prepared as a change.
• Basic usage: 着替えを済ませる presents the changing action as complete, while 着替えを一組持つ refers to one spare set kept for getting wet.

2. Common pitfalls and similar expressions

• The changing action
  • The first use is the completed action of changing after exercise. Example: 運動の後で着替えを済ませました。 — I changed clothes after exercising.
• One spare set
  • The second counts the clothes themselves, not the act of changing. Example: 雨に濡れたときのために着替えを一組持ってきました。 — I brought a spare set of clothes in case I got wet in the rain.