〜ずくめ
nothing but, entirely
Noun + ずくめ(の + Noun / だ)
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ずくめ means something is made up entirely of one thing: 今年はいいことずくめだった, "this year was nothing but good things".
It's often positive: いいこと, めでたいこと ("happy events"), ごちそう ("feasts"). It also describes colour: 黒ずくめの服, "all in black". Occasionally it's negative: 規則ずくめの生活, "a life that's all rules".
Compare だらけ (N3), "full of", which is almost always negative and suggests mess (間違いだらけ, 傷だらけ), and まみれ (N2), "covered in (something messy)". ずくめ is about the overall character of a whole period or outfit. A quick test: if the thing is good, or it's a colour, ずくめ is almost always the answer.
Examples
今年はいいことずくめだった。
This year was nothing but good things.
彼女はいつも黒ずくめの服を着ている。
She always dresses all in black.
結婚に昇進と、めでたいことずくめの一年だった。
With a wedding and a promotion, it was a year full of happy events.
規則ずくめの生活にうんざりしている。
I'm fed up with a life that's all rules.
旅行中はごちそうずくめの毎日だった。
Every day of the trip was one feast after another.