That dress that looked effortless on the model? The difference between wearing it once and reaching for it all summer often comes down to one thing: choosing for the garment’s fit, not just the number on the tag. This boutique clothing size guide makes it easier to shop the pieces you love with confidence, from a bias-cut maxi for holiday dinners to denim you will wear on repeat.
Boutique sizing is intentionally more considered than a one-size-fits-all high-street rack. Collections can include different labels, fabrics, silhouettes and fits, so a size 10 in one piece may sit differently in another. That is not a reason to overthink it. It is a reason to start with your measurements, read the product fit notes and choose the feel you want from the outfit.
Why boutique sizing can feel different
A curated boutique edit is built around shape, fabric and the way a piece is meant to move. A fitted linen mini, a relaxed cotton shirt and a stretch knit co-ord should not be expected to fit in the same way, even when they carry the same size label.
Some pieces are designed to skim the body, while others are cut with room through the waist or sleeve. Natural fibres may feel more structured at first and relax with wear. A ruched jersey dress can offer give where a tailored pant cannot. Imported labels can also use different base measurements, which is why the size chart and product description matter more than assuming your usual size will always translate.
Think of the listed size as a starting point. The garment details tell you how the piece will actually wear.
Boutique Clothing Size Guide: take your measurements first
Your best shopping tool is a soft tape measure and two quiet minutes before you start adding to cart. Measure over close-fitting clothing or directly against the body, keeping the tape level and snug without pulling it tight. Record your measurements in centimetres on your mobile so they are ready whenever a new arrival catches your eye.
Bust, waist and hips
Measure your bust around the fullest part, with your arms relaxed by your sides. For your waist, find the narrowest point of your torso, usually just above your belly button. Your hip measurement should be taken around the fullest part of your hips and seat, rather than high on the hip bone.
These three numbers will cover most dresses, skirts, pants and shorts. If you sit between sizes, let the garment shape decide. For a structured item without stretch, prioritise the largest relevant measurement. For a relaxed shirt, oversized blazer or elasticated-waist skirt, you may prefer to size down if you want a neater line.
Length, rise and the details that change everything
For trousers and jeans, knowing your preferred inseam and rise is useful. Measure the inside leg from crotch to ankle for inseam, then compare it with a pair you already love. A high-rise style should sit at your natural waist; a mid-rise style will sit lower. Neither is better, but the rise can completely change how a pant feels through the hips and torso.
For dresses and skirts, check the listed length against a favourite piece in your wardrobe. Hold the tape from your shoulder to the point where you want the hem to fall. If you are petite, a midi may wear closer to maxi length. If you are taller, a mini might feel more like an easy daytime hem. Styling can help, but measurements prevent surprises.
Read the fit notes like a stylist would
A size chart gives the numbers. Fit notes give the personality of the piece. Words such as fitted, relaxed, oversized, slim, bodycon and true to size are useful directions, especially when paired with information about fabric and model sizing.
If a dress is described as fitted through the bust with a fluid skirt, your bust measurement should lead the decision. If a top is intentionally oversized, ordering your standard size will usually achieve that editorial, borrowed-from-holiday look. Sizing down changes the silhouette, not just the measurement.
Fabric composition matters just as much. Elastane, rib knit and soft jersey usually offer stretch and recovery. Linen, poplin, denim and tailored suiting generally have less give, unless the product details say otherwise. A non-stretch piece should feel comfortable when you sit, lift your arms and move through a long lunch. A beautiful fit that only works when standing still is rarely the piece you will keep reaching for.
Also look for adjustable details. Tie shoulders, back shirring, elasticated waistbands, belts and adjustable straps can make a style more flexible across bust lengths, waist shapes and preferred coverage. They are especially useful when packing a smaller holiday wardrobe that needs to work harder.
Choosing your size by category
Dresses and skirts
For a fitted mini, occasion dress or slip silhouette, choose from your bust and hip measurements, then check whether the waist is elasticated or fixed. If your bust and hips fall across two sizes, a style with an adjustable waist or open skirt shape gives you more room to choose the size that feels best up top.
With wrap dresses, remember that the wrap itself adds flexibility, but the shoulder and bust still need to sit comfortably. A wrap that pulls open at the chest is not the right fit, no matter how adjustable the waist tie may seem.
Tops, shirts and knitwear
For tanks, fitted tees and corset-inspired tops, the bust is your key measurement. If you prefer extra coverage or do not want fabric pulling across the chest, sizing up can be the more polished choice. For breezy shirts and resort layers, stay with your usual size for the intended relaxed fit.
Knitwear depends on the knit. Fine ribbed styles often hug the body and stretch with wear. Chunkier knits can have more structure, so pay attention to shoulder width and sleeve length as well as the bust measurement.
Pants, shorts and denim
Start with waist and hip measurements, then check the rise and fabric stretch. If you are between sizes in rigid denim, size up is often the more comfortable option, particularly if the jean is fitted through the thigh. If it contains stretch, consider how you like denim to feel after several hours of wear rather than just in the change room moment.
Wide-leg pants and pull-on shorts can be easier across sizes, but do not assume every elastic waist is equally generous. Check whether the garment measurement refers to the relaxed or stretched waistband where that information is available.
Swimwear and sets
Swim should feel secure without digging in. Your bust, underbust, torso length and coverage preference all play a part, particularly in one-pieces. Adjustable straps and tie sides offer more flexibility, while a fixed underwire top needs closer attention to bust fit.
For matching sets, do not let the convenience of a co-ord override fit. A top and bottom may suit different sizes depending on your proportions. Where separate sizing is available, choose each piece for the way it should support and flatter you.
When you are between sizes
Being between sizes is completely normal. The right choice depends on the design, the fabric and what will make you feel most like yourself in the piece. Size up for a defined waist, non-stretch fabric, a fuller bust or hip, and any style you want room to move in. Consider sizing down only when the fit is deliberately relaxed, the fabric has generous stretch or you prefer a closer shape than shown.
Do not buy a smaller size as motivation, and do not size up automatically because a label is unfamiliar. The best wardrobe pieces are the ones that let you get dressed without negotiating with the mirror.
If you are still unsure, compare the product measurements and fit description with a similar item you already own and wear often. Lay that favourite garment flat, measure it across the bust, waist, hips or inseam, then compare the result with the product information. It is one of the simplest ways to shop an unfamiliar silhouette online.
Make the final call before checkout
Before you choose a size, picture when and where you will wear the piece. A floaty holiday dress needs enough ease for warm afternoons and a long dinner. A tailored blazer may need room for a tee or fine knit underneath. A party mini should let you sit comfortably, dance freely and feel as good at midnight as it did when you first tried it on.
At Bow & Arrow Trading, the most wearable wardrobe is not built around a perfect number. It is built around pieces that suit your shape, your plans and your personal version of polished coastal style. Trust the measurements, use the fit notes, and choose the size that lets the outfit do what it should: make getting dressed feel easy.