noun
Refers to a sweet sugar coating on cakes or pastries. The word is a compound of 砂糖 (sugar) and 衣 (coating/garment).
ケーキに砂糖の衣をかける。
I pour icing over the cake.
このクッキーは砂糖の衣がかかっている。
These cookies are coated with frosting.
フロスティング is another loanword for 'frosting', used in Western-style baking. 砂糖の衣 is a broader term for any sugar-based coating, not limited to buttercream-style frostings.
Compound of 砂糖 (sugar) and 衣 (clothing, coating), literally 'sugar coating'. The word follows a common pattern of using 衣 to describe a layer covering something.