also: しちぶだけ
noun which may take the genitive case particle 'no'
three-quarter length
Typically used for clothing that reaches about three-quarters of the full length, such as pants or sleeves.
In summer, I like three-quarter length pants because they are cool.
This three-quarter length cardigan is just right for spring.
長袖 means 'long-sleeve', the full-length counterpart to 七分丈.
Standard kanji spelling; the reading しちぶたけ is the most common.
Alternate reading; しちぶだけ is also used but less common.
七分 (seven-tenths) + 丈 (length). The term describes a length that is about 70% of the full length.