盛装なさる必要はありません。

盛装なさる必要はありません。

You don't have to dress up.

盛装(せいそう)なさる必要(ひつよう)はありません。

Seisō nasaru hitsuyō wa arimasen.

盛装 (せいそう)

dressed up; wearing rich clothes

為さる (なさる)

to do

必要 (ひつよう)

necessary; needed; essential; indispensable; necessity; need; requirement

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

有る (ある)

to be (usu. of inanimate objects); to exist; to live; to have; to be located; to be equipped with; to happen; to come about

Readings: セイ、ジョウ、も.る、さか.る、さか.ん

Meanings: boom, prosper, copulate

Readings: ソウ、ショウ、よそお.う、よそお.い

Meanings: attire, dress, pretend, disguise, profess

Readings: ヒツ、かなら.ず

Meanings: invariably, certain, inevitable

Readings: ヨウ、い.る、かなめ

Meanings: need, main point, essence, pivot, key to