Height
Length
noun
The kanji and the word are exactly the same. That means they share meanings as well. This word is usually used for clothing height and length.
The reading is different from what you learned with the kanji. Remember the word 竹? It has the same reading as this. Just think of everyone measuring the heights of things with bamboo (たけ) poles with markers on them. Okay, this one is 5 bamboo poles high!
ユニクロで、七分丈のパンツを買いました。
I bought a pair of three-quarter-length pants at UNIQLO.
そのズボン、ちょっと丈が短いんじゃない？
Isn't the length of those pants a bit short?
今年は、女子高生の間でスカートの丈を長くするのが流行っています。
The trend among high school girls this year is to wear longer skirts.