Have to wear a yukata with 〜なくちゃ

ママ:

「せっかくお祭(まつ)りに行(い)くんだから」

“Since you're going to the festival and all...”

「やっぱり浴衣(ゆかた)くらい着(き)なくちゃね」

“You really should wear a yukata at least.”

Key Points

1. 着(き)なくちゃ = have to wear

   • The verb is 着(き)る “to wear”; its negative stem 着(き)ない becomes 着(き)なくちゃ in this obligation pattern.

   • 〜なくちゃ is a casual contraction of 〜なければならない or 〜なければいけない, used here as “have to”.

2. せっかく…んだから sets up the reason

   • せっかくお祭(まつ)りに行(い)くんだから means “since you’re going to the festival after all”.

   • The んだから gives the reason for the mother’s suggestion.

3. やっぱり adds “of course”

   • やっぱり frames the yukata as the expected choice for a festival, matching the translation’s “really”.

4. 浴衣(ゆかた)くらい softens the expectation

   • くらい presents the yukata as the least fitting thing for the occasion: “at least a yukata” or “something like a yukata”.

5. Final ね makes it conversational

   • The sentence-ending ね invites agreement, so the line sounds like friendly parental guidance rather than a strict order.