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。tyoudo 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 ha tyoudo 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 tyawan ha gohan wo taberuno ni tyoudo ii ookisa desu.
This bowl is just the right size for eating rice.
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