Your jeans are the latest fashionable cut; your trainers are from a cult brand that nobody your own age has ever heard of, and your rigorous skincare regime has taken years if not decades off your face.

But no matter how youthful your overall look, wearing the wrong style of coat is the one faux pas that can instantly undo all your good work.

Speaking to the Daily Mail, celebrity stylist Lisa Talbot has revealed how coats are the often-overlooked telltale sign of age - even if you've splashed out on a 'classic' like a Burberry trench.

Talbot said: 'A coat is the hardest-working piece in your wardrobe. It's what everyone sees first and often the only part of your outfit on display for months at a time.

'But if the cut, length or detailing is dated, it doesn't matter how modern your jeans or knitwear are underneath. An ageing coat will instantly timestamp your entire look.'

Read on to see which coats aren't working in your favour - and what to wear instead...

The structured trench  

Lisa said: 'The Burberry trench will always be a classic. But some older versions, particularly those with rigid shoulders, heavy epaulettes and a very traditional knee-length cut can feel corporate rather than contemporary.'

Why it ages you

She explained that, it's not the style of coat that ages its wearer, but its shape. Talbot added: 'The problem isn't the trench itself. It's the stiffness.'

What to wear instead

'Look for a softer, fluid trench with relaxed shoulders and a slightly oversized silhouette. 

'A longer length, which is just below the knee or mid-calf, instantly feels more current.' 

The bulky, shiny puffer

Lisa continued: 'Puffers are practical but overly shiny fabrics, heavy quilting and cropped lengths can overwhelm your frame and add visual bulk.

'If it's padded, glossy, and finishes at the widest part of your thigh, it's likely ageing you.'

Why it ages you

While understated puffers suit most people, Talbot warned that the more extravagant options can appear frumpy on older wearers.

What to wear instead

'Opt for a matte fabric, cleaner quilting, and a longer line. Subtle shaping or a gentle belt will create definition without bulk.' 

The fussy detail coat

Lisa said details such as too many buttons, contrasting trims, decorative collars, and excessive hardware can 'anchor a coat to a very specific era, particularly late 2000s tailoring'.

Why it ages you

Talbot said, 'Modern style is about restraint', and so, opting for something in contrast suggests a dated approach to fashion.'

What to wear instead

'Choose clean lines, minimal fastenings and strong shape. The less 'stuff' happening, the more expensive and contemporary it feels.'

The draining neutral

Talbot said: 'Black can be harsh against mature skin. Pale beige can wash you out. Dark brown can feel heavy.'

Why it ages you

She explained: 'If the coat sits close to your face for months at a time, the wrong colour will exaggerate shadows and dullness.'

What to wear instead 

'Choose richer, flattering tones such as navy, chocolate, forest green or burgundy, colours that add depth without overpowering.'

The short, fitted black wool coat

Talbot said: 'Many women are still wearing the same tailored black coat they bought a decade ago, nipped at the waist, narrow lapels, finishing mid-thigh.'

Why it ages you

The stylist added: 'This silhouette instantly dates you because proportions have changed. Shorter, tighter coats now feel like '2010 officewear'.

What to wear instead 

'Choose a longer, straighter cut that skims rather than clings. Broader lapels and a relaxed fit create authority and elegance.'

The awkward length coat

The stylist said: 'Coats that finish mid-hip or directly on the knee can visually cut your body in half. This shortens your leg line and disrupts proportion.'

Why it ages you

The length of the coat, Talbot explained, can throw of proportions. The stylist said: 'It's not about your height, it's about balance.'

What to wear instead

'Mid-calf or longer lengths create a column effect and elongate the frame beautifully.'

The tired investment piece

She said: 'Even the most beautiful coat can age you if it looks worn with shiny elbows, sagging lining and a softened structure.'

Why it ages you

If the coat has lost its shape, it's doing its wearer no favours. Talbot said: 'Outerwear should hold its shape. If it doesn't, it drags everything down with it.'

What to wear instead 

'If your coat has lost structure, it's time to replace or professionally re-line it. A crisp, structured fabric instantly restores polish.'