kkaekkeushan oseun osgeorie jeongrihae georeo dumyeon jureumi an saenggyeoyo.

깨끗하다 means “to be clean.” When you want to modify a noun with a descriptive verb ending in -다, you change it to the adjective form -ㄴ/은.

• 깨끗하다 → 깨끗한
• 깨끗한 옷 → “clean clothes”
  The 은 on 옷은 is the topic marker, so 깨끗한 옷은 literally says “As for clean clothes…”

옷걸이 means “clothes hanger.” The particle -에 indicates the location where an action takes place.

• 옷걸이 + 에 → 옷걸이에 (“on the hanger”)

This is a chain of three verbs plus a conditional ending:

1. 정리하다 (“to organize”) → connective form 정리해
2. 걸다 (“to hang”) → connective form 걸어
3. 두다 (“to leave [something] in place]”) → conditional 두면 (두다 + -면)
   Together, 정리해 걸어 두면 means “if you organize, hang, and leave (the clothes) [on the hanger]…”

Wrinkles aren’t something you “have” or “not have” in the same way you’d say “I don’t have a pen (펜이 없어요).” Instead, wrinkles “form” or “occur” on garments. The verb 생기다 means “to arise” or “to come into being.”

• 주름이 생겨요 = “wrinkles form”
• 주름이 안 생겨요 = “wrinkles don’t form”

Yes. 생기지 않다 is the same verb with the more formal negative -지 않다.

• 주름이 안 생겨요 (common, conversational)
• 주름이 생기지 않아요 (slightly more formal or neutral)
  Both are correct; the choice depends on register and style.

Yes, they’re the same meaning. Verbs ending in -하다 form the connective -해 colloquially (instead of -하여 or -해서).

• 정리하다 → 정리해 → 정리해 걸어 두면
  You can also say 정리해서 걸어 두면, but Koreans often shorten -해서 to -해 in speech.