Note
大きさ is more general than サイズ. For shoes, clothes and other items that come in standardized sizes, it's more common to hear サイズ.
Breakdown of ookisa
big
大
This guy is so big that everywhere he goes, there's only space for one person.
Usages of ookisa
丁度 いい 大きさ です ね。choudo ii ookisa desu ne.
It's just the right size, isn't it.
この 箱 の 大きさ は 丁度 いい です ね。kono hako no ookisa wa choudo ii desu ne.
The size of this box is just right, isn't it?
この 茶碗 は ご飯 を 食べるの に ちょうど 良い 大きさ です。kono chawan wa gohan o taberuno ni choudo ii ookisa desu.
This bowl is just the right size for eating rice.
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