あつらえ向むき

also: おあつらえむき

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Meanings

1

noun which may take the genitive case particle 'no'

Describes something that fits a need or situation exactly, as if custom-made. Often used with the polite prefix お〜.

あつらえ向むきUsage40%
Common kana-kanji mixed spelling. The kanji 向き is standard; あつらえ is usually written in kana.
誂あつらえ向むきUsage36%
Full kanji spelling is rare and may not be recognized by all readers.
あつらえむきUsage24%
おあつらえ向むき
Polite prefixed form, very common in everyday speech.

ぴったり
ぴったり is a more general adverb/adjective for a perfect fit, while あつらえ向き emphasizes being custom-suited for a specific purpose or person.
最さい適てき
最適 is a more formal, technical term for 'optimal', whereas あつらえ向き is colloquial and carries a nuance of being specially made or arranged.

From あつらえ (custom order, from verb あつらえる 'to order') + 向き (suitable, direction). Literally 'suitable as if ordered'.