A work wardrobe built in the wrong order is how people end up with six blouses and nothing to wear them under a jacket with. The order that works is: one jacket that reads as tailoring, two bottoms that match it in weight, three tops you would wear on their own, and one bag that takes a laptop. That is seven pieces and roughly fifteen outfits, which covers a normal fortnight.

Start with the jacket, because everything else is chosen to sit under it. A single-breasted blazer in a mid-weight wool, wool crepe or compact knit is the most useful version, since it works over a shirt, a fine knit and a dress without changing the line. Buy it in navy, charcoal or a mid brown rather than black, which is harder to match and reads more formal than most offices now are.

Then buy the bottoms to the jacket, not the other way round. Matching weight matters more than matching colour: a heavy wool blazer over thin summer trousers always looks mismatched, even in the same shade.

For the jacket, check three things in the mirror. The shoulder seam should sit at the edge of your shoulder, not past it, because that is the one thing a tailor cannot fix cheaply. The sleeve should end at your wrist bone. And you should be able to cross your arms in front of you without the back pulling. Buttoning is optional in practice, but it should close without gaping.

On trousers, decide by rise and leg rather than by size. A mid to high rise with a straight or gently flared leg is the most forgiving across body shapes and the easiest to wear seated all day. Compact milano knit and wool crepe resist creasing through a commute; linen and cotton twill do not. If you sit for six hours, that difference is the whole day.

For tops, prioritise anything you would wear with the jacket off. Cotton sateen and silk blouses read finished on their own. A fine crewneck or turtleneck in merino or cashmere does the same job with less fuss and no ironing.

The useful test is whether you can dress in fifteen minutes without thinking. If any piece requires a specific second piece to work, it is a liability, not a building block.

Wear the pieces apart, not as sets. The blazer over denim on Friday, the tailored trousers with a knit and no jacket, the shirt under a sweater with only the collar showing. A seven-piece wardrobe only stretches if you break the obvious pairings.

Build a second bottom in the same colour family as the first, so a single jacket covers both. If your blazer is charcoal, a charcoal trouser gives you a suit and a navy or camel one gives you a separate outfit. That is two looks from one purchase.

For the bag, measure before you buy. A 14 inch laptop needs about 15 inches of interior width, and a lot of bags sold as work totes do not have it. A structured tote or a large bucket in grained leather is the sensible answer, because it stands up on its own next to a desk and does not mark in rain. Keep the hardware quiet and the colour mid: burgundy, brown and deep green hide wear far better than black bases or cream sides.

Shoes are the last purchase, not the first. One flat you can walk in and one low heel covers everything.

The advice to invest in a great blazer is right, but it is usually given without the part that matters, which is that you have to buy the trousers to the blazer's weight or the money is wasted. We have watched more work wardrobes fail on that mismatch than on quality.

We would also push back on buying for the job you want. Buy for the commute and the chair you sit in, because the pieces that survive are the ones that do not crease, do not need ironing at seven in the morning, and do not require a specific partner piece. Glamour is the wrong filter here. Repeatability is the right one.

If you take one thing away, take the order: jacket first, bottoms to match its weight, then tops you would wear alone. Buy in that sequence and a small wardrobe covers a full fortnight without you thinking about it once.