Kylie Minogue wears straight-leg jeans and heeled boots - the best duo for smart-casual styling this autumn.

Autumn outfits can be surprisingly hard to judge. Bare ankles feel chilly, heavy winter layers are often too much, and jeans can look too casual when a coffee run turns into lunch, drinks or dinner. A dependable answer is straight-leg jeans with heeled ankle boots: relaxed denim, sharpened up by footwear with a little structure.

The trick is not to make jeans look overly formal. It is to get the hem, boot shape and proportions right, then add layers that suit the changeable British weather. With boots you can genuinely walk in, this pairing can work for weekends, relaxed workplaces and last-minute evening plans.

Why this combination works

Straight-leg jeans create a clean line from hip to hem. They are less close-fitting than skinny jeans and less voluminous than wide-leg styles, so they tend to sit neatly over ankle boots without too much fabric gathering at the ankle.

A heel adds definition, whether it is a low kitten heel, a sturdy block heel or a medium stacked heel. Jeans keep the outfit grounded, while the boots make it appear considered rather than thrown on.

The aim is not to turn denim into officewear. It is to use a neat boot and balanced layers to make everyday jeans feel more polished.

The pairing also makes practical sense in autumn. Ankle boots offer more coverage than trainers or loafers when pavements are wet, and straight-leg jeans leave enough room for ordinary socks without feeling bulky.

Start with the right straight-leg jean

Look for jeans that feel comfortable at the waist and seat, then fall in a fairly uninterrupted line through the leg. A straight fit does not need to be tight: a slightly relaxed cut can look current and feel easier to wear over boots.

Useful details to consider include:

• A mid-rise or high-rise waist if you like to tuck in T-shirts, shirts or fine knits.
• A hem that meets the top of the boot or finishes just above it.
• Denim with enough structure to hold its shape through the day.
• A simple wash and finish, such as mid-blue, indigo, black, charcoal or ecru.
• Minimal pooling around the ankle, which can make the whole outfit look heavier.

An ankle-grazing hem is particularly useful with heeled boots, as it reveals a little of the boot shaft. If your favourite jeans are too long, having them altered is usually a more reliable option than relying on a heel to lift them clear of the ground.

A quick fitting-room check

1. Wear the type of socks you would usually choose in autumn.
2. Try jeans on with boots, rather than assessing the length barefoot or in trainers.
3. Walk, sit and stand sideways in the mirror.
4. Check that the hem does not catch awkwardly on the boot shaft.
5. Look at the outfit from the front and side to make sure the length appears deliberate.

Choose heeled boots for real life

Heeled does not have to mean high. A low block heel, a kitten heel or a medium stacked heel can provide the smarter finish without making a full day on your feet uncomfortable.

A pointed or softly almond-shaped toe can lengthen the appearance of the leg, while a round toe makes the outfit feel more relaxed. Slim ankle boots are often easiest to wear beneath straight-leg jeans, but slightly roomier shafts can work if the denim is not bunching over them.

These colours are especially versatile:

• Black, for darker denim and evening outfits.
• Chocolate, tan or toffee brown, which work well with blue denim.
• Burgundy or oxblood, for a subtle seasonal alternative to black.
• Taupe or deep grey, for softer neutral combinations.

Suede adds warmth and texture, but it needs more care in rain. Apply a suitable protector before wearing new suede boots, allow them to dry naturally if they get wet, and remove dry mud gently with a suede brush. Leather or treated synthetic boots may be easier for a damp commute.

Four easy ways to wear the look

1. The weekend version

Pair mid-blue straight-leg jeans with tan block-heeled boots, a tucked-in white T-shirt and a chunky cardigan. A crossbody bag and simple jewellery keep it relaxed but pulled together for errands or lunch.

2. The smarter dinner version

Choose dark indigo or black jeans with black pointed-toe boots. Add a fitted knit, satin-style blouse or simple bodysuit, then a blazer. Keeping the palette darker can make denim feel suitable for an evening booking without looking stiff.

3. The relaxed workday version

For a workplace where jeans are acceptable, try clean, non-ripped dark denim with low heeled boots, a fine-gauge jumper and a tailored coat or blazer. Keep accessories understated and check your workplace dress code first.

4. The colour-led version

Use blue denim and neutral boots as the base, then add a berry, rust, forest-green or soft yellow knit. Brown or burgundy boots can help tie richer autumn colours together without making the outfit feel over-styled.

Get the proportions right on top

Straight-leg jeans suit both fitted and relaxed tops. The key is to create some definition at the waist, or make the shape of the outfit clearly intentional.

With high-waisted jeans, a full tuck, partial front tuck or shorter cardigan can help define the waist. If you prefer a longer jumper, try adding a shorter jacket over it. Under an oversized coat, a neater knit or T-shirt underneath can stop the overall silhouette from feeling swamped.

Cardigans are particularly useful at this time of year. One that ends around the waistband can be worn buttoned as a top, or open over a T-shirt. A leather jacket, trench coat or wool-blend blazer changes the mood of exactly the same jeans-and-boots base.

When the jeans are relaxed, a cleaner ankle line and some definition through the waist keep the outfit looking polished rather than accidental.

Common mistakes to avoid

A few small details can make this otherwise simple combination look less successful.

• Jeans that are too long: bunched hems can look untidy, become damp on wet pavements and hide the boots.
• Bulky boots under narrow hems: if the shaft fights against the denim, choose a slimmer boot or a roomier jean.
• An impractical heel: wet leaves, uneven paving and station platforms are good reasons to favour a lower, wider heel.
• Forgetting boot condition: scuffed toes and dried mud stand out when boots are a focal point of the outfit.
• Too many competing statements: distressed jeans, bold boots, a slogan top and a dramatic coat can overwhelm each other.
• Assuming every wash dresses up equally: very pale or heavily faded denim usually reads more casual than dark indigo or black.

Care and comfort in wet weather

Break new boots in at home before relying on them for a long day. Wear the socks you expect to use, walk on clean indoor flooring and note any rubbing at the heel, ankle or toes. Blister plasters can help protect minor friction, but persistent discomfort usually means the fit or shape is not right for you.

Choose soles with some grip when rain is forecast, and take extra care on wet stone, metal grates and leaf-covered paths. Avoid rushing in heels, particularly where surfaces are uneven.

Do not machine-wash suede boots or dry them directly on a radiator. Excessive heat can affect their shape and finish. Follow the footwear maker’s care instructions for protectors and cleaning products, and test any product in an inconspicuous area first.

Make it an autumn uniform

Straight-leg jeans and heeled boots offer a useful outfit base, not a strict rule. Start with jeans that sit well, boots you can comfortably walk in and a layer that matches the temperature. Then change the knit, jacket, bag or jewellery depending on where you are going.

For those in-between October days when you want to look presentable without spending ages getting dressed, it is an easy formula to return to: practical enough for everyday life, smart enough for spontaneous plans and varied enough to wear repeatedly in different ways.