Cheerful and grown-up are not opposites — they just have to be balanced properly!
Just imagine the look of a patchwork quilt: squares of rose, teal, buttercup and cream, some checked, some dotted, some plain, set side by side. Now stop imagining, because this sweater carries that whole quilt across the body.

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A Quilt In Knit
Each square carries its own small pattern — gingham, dots, fine stripe — inside a larger grid. The variety is what makes it feel handmade rather than printed.
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Balanced Colour
Warm rose and buttercup are held in check by cool teal and plenty of cream. That balance is what keeps a bright palette from tipping into loud.
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Soft Waffle Ground
The textured stitch shows through every square, tying the patchwork together and giving the piece the substance of proper knitwear.
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Relaxed Through The Body
The cut skims instead of clinging, with a dropped shoulder and a gently curved hem that sits just past the hip. Take your usual size for the easy drape you see here, or go one up if you like a little more room. It comes in S through 5XL, and the shape is drafted for each one rather than simply scaled up.
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Everything Else Stays Plain
With this much happening above the waist, plain trousers finish it in one move. Cream, denim and black all work.
The fear with a colourful piece is that it wears you rather than the other way round. The squares here are small and the cream between them does the calming, so it stays comfortable to wear — and comfortable is what gets repeated.