Retail floors, hospital corridors, kitchens and workshops share one feature: by the end of the day you feel every seam you chose that morning. Clothes that pass the mirror test at eight can be unbearable by four, and the reason is rarely the size on the label. It is usually a waistband sitting on the wrong part of the torso, or a bra band that has quietly given up.

Support comes from the band, not the straps

By hour six, most complaints trace to the same place. If your shoulders ache and the straps have left grooves, the band is too loose and the shoulders have carried the load all day. A band should sit level around the ribcage, low at the back, and feel firm on the loosest hook when new. Tightening straps to compensate is the classic wrong fix.

Get the band right and the rest follows

When the band is correct, tops sit where the pattern intended and everything else gets simpler. Ranges built on proper grading rather than scaled-up patterns make this easier, so it helps to shop where band and cup are separate decisions. Just My Size publishes measurements for both the 1X to 5X grid and the 16W to 32W numbers, which matters, because those two systems have never mapped neatly onto each other.

Waistbands that stay where you put them

Standing work means constant small movements: reaching, bending, turning to a shelf. A waistband sitting exactly on the natural waist will migrate; one slightly higher, wide and flat rather than a narrow elasticated tube, tends to stay. Look for a band at least five centimetres deep with the elastic in a casing.

How fabrics behave over eight hours

Cotton is comfortable for three hours and heavy once damp. A cotton blend with a little synthetic dries faster and creases less, which is why uniforms use it. Pure polyester moves moisture well but holds odour, so it needs washing after each wear. Viscose drapes beautifully and weakens when wet, so it is a poor choice for anything you tug at all day.

Your friction map

Everyone has one: the places where fabric meets skin all day, usually under the bust, inner thighs and underarms. Dry skin, breathable fabric and a change of underwear partway through a long shift do more than any product. If irritation keeps returning in the same spot regardless, that is a question for a doctor rather than another purchase.

What belongs in a locker

• A spare pair of briefs and a spare vest, sealed in a bag
• A second bra in the same size, so one is always dry and rested
• A light long-sleeved layer for cold storage or aggressive air conditioning
• Spare socks and a hair tie, which cost nothing and rescue a day
• A safety pin, which has fixed more hems mid-shift than any tailor

Rotation beats endurance

A bra worn two days running has no time for its elastane to recover, and the band loosens noticeably faster. Three bras rotated across a week outlast two worn hard. Elastane in heavy use gives out somewhere between six and twelve months; that is ordinary wear, not a fault, and it explains why a band that once fitted on the loosest hook eventually fails on the tightest.

The one change most people feel first

If you alter a single thing, re-measure and try a smaller band with a larger cup. Most people uncomfortable at work are wearing a band too big and a cup too small, which produces exactly the symptoms they blame on underwire as a category. Wire that hurts is nearly always the wrong shape or volume, sitting on tissue instead of behind it.