A menswear rail is mostly navy, grey, black, white and olive. The narrowness is a stock decision made in advance rather than a reflection of what men would wear if offered more.
Colour multiplies the inventory problem
Every colour of a style has to be stocked in every size. A style in eight sizes and two colours is sixteen distinct items to forecast, buy and hold.
Adding a third colour adds eight more, each with its own demand curve and its own chance of being left over at the end of the season.
Retailers therefore add colours only where the expected sell-through justifies the additional risk, and unusual colours rarely clear that bar.
Replacement buying favours the familiar
A large share of menswear purchases replace something that wore out, and the default replacement is the same item in the same colour.
That behaviour makes core colours extremely predictable to forecast, which is exactly the property a buyer wants in a continuity line.
Predictability lets those items be bought deep, at better prices, and carried across seasons without markdown risk.
Combinability is doing real work
A narrow palette means almost any two garments in a wardrobe can be worn together, which reduces the number of pieces needed for a working set of outfits.
A strongly coloured garment combines with fewer things, so it needs its own supporting pieces and delivers fewer outfits per item bought.
Buyers register that intuitively, which is why the bright item in a range often sells slowly even when customers say they like it.
Workwear conventions set the floor
Professional dress codes narrowed to dark neutrals over a long period, and even as formality relaxed the acceptable colour range moved slowly.
Anything worn to an office is judged against that residual expectation, which suppresses demand for strong colour in the categories bought most often.
Categories outside that constraint, such as knitwear, outerwear linings and sportswear, carry noticeably more colour for exactly this reason.
Where the palette does open up
Seasonal capsules and small drops let a brand test colour without committing inventory across the full size range for a whole season.
Accessories carry colour more easily because they are one-size, cheap to hold and low risk if they do not sell immediately.
The result is a structure where colour lives at the edges of a range while the core stays neutral, and the pattern reflects stock economics rather than taste.