noun which may take the genitive case particle 'no'
specially tailored; tailor-made; specially arranged
Used for clothing made to order, or for transportation (train, plane, etc.) arranged specifically for a group or purpose. Often appears as 別仕立ての before a noun.
彼は別仕立てのスーツを着ていた。
He was wearing a tailor-made suit.
団体旅行のために別仕立てのバスが用意された。
A specially arranged bus was prepared for the group trip.
オーダーメイド is a common loanword for custom-made items, especially clothing. 別仕立て is more formal and can also apply to services like transportation.
Compound of 別 (separate, special) and 仕立て (tailoring, preparation). The exact historical derivation is uncertain, but the word has been used since at least the early modern period to refer to something made or arranged separately for a specific purpose.