Direct answer
On a general blouse chart, start with your bust measurement, find the row it falls in, and use waist and hip as checks, not as the deciding measurement. The bust must close over the buttons without gaping, while the waist shaping and hem can usually be judged from the same row. Treat every chart as a starting range for that brand, and always compare it with the brand's own chart before ordering.
The general blouse bust chart
The table below gives broad adult bust ranges that many general charts use as starting points. These are body measurements in inches, not finished garment measurements, and they assume a blouse with a little ease for movement. A brand that cuts close to the body will use narrower ranges, and a brand that cuts relaxed will use wider ones, so this table points you to a row to try first rather than a size that is guaranteed to fit.
| Label size | Bust range in inches | What to expect |
|---|---|---|
| XS | 31 to 32 | Smallest general range, close shaping |
| S | 33 to 34 | Light shaping, narrow shoulders |
| M | 35 to 37 | Middle range, most dart options |
| L | 38 to 40 | fuller bust shaping, wider placket |
| XL | 41 to 43 | Generous bust room, check shoulder width |
| XXL | 44 to 46 | Largest general range, check sleeve length |
How to read one row properly
A chart row is a promise about the body the blouse was drafted for, not a description of the finished garment. The finished blouse will be a little larger than the body range, because ease is built in for breathing, sitting and reaching. How much ease depends on the cut: a fitted blouse may add only a small amount at the bust, while a relaxed blouse adds much more, so two blouses in the same label size can measure quite differently when laid flat.
Read the row from left to right as a set of checks. First, does your bust fall inside the range? Second, does your waist fall near the waist range for that row on the brand chart, if one is given? Third, does the shoulder width suit you? A row that passes the bust check but fails the shoulder check will still feel wrong, because the seams will sit past your shoulder point and the sleeves will hang long.
Waist and hip are checks, not the driver
Many shoppers start with waist size because trousers are sized that way, but a blouse is a top, and its closure is at the bust. If your bust points to medium and your waist points to small, start with medium. The waist of a medium blouse can often be taken in, or the blouse may have a relaxed waist that still looks fine. Starting with small would risk a placket that gaps at the bust, which is much harder to fix.
Hip matters mainly for longer blouses and for styles worn untucked. If a blouse ends below the waistband, check that the hem clears the hip without pulling. For a tucked blouse, hip size matters less, because the fabric is gathered at the waistband rather than falling over the hip. Keep hip as a secondary check and let bust lead.
Between rows: which way to go
Falling between rows is normal, and the right choice depends on fabric and cut. For a woven blouse with no stretch, choose the larger row as your starting point. You need the placket to close and the bust to move without strain, and a slightly loose waist is easier to live with than a gaping placket. For a blouse with stretch, such as a knit-backed or elastane blend blouse, the smaller row may still work, because the fabric gives at the bust.
Also consider the style. A fitted blouse with princess seams shows a between-size choice more clearly than a relaxed blouse with a gathered body, because fitted shaping has less room to hide. If you are between rows in a fitted style, lean larger. If you are between rows in a relaxed style, either row may work, and the choice becomes one of how much drape you prefer.
Why the same label fits differently at two brands
Label sizes are not standardised across brands. One brand may draft its medium for a 36 inch bust, another for a 38 inch bust, and a third may use the same label for a different body shape entirely, such as a longer torso or narrower shoulders. Country systems add another layer: a label that means one thing in one market may be graded differently in another, even when the letters look the same.
The practical answer is to ignore the label and read the numbers. Compare your bust, waist and hip measurements with the chart of the brand you are actually buying from, row by row. If a brand gives no chart, treat its label as a guess and favour retailers with a returns policy that lets you try two sizes. Over time you will learn which brands run small or large for your shape, and that knowledge is worth more than any general chart.
Chart mistakes that cause most returns
The most common mistake is measuring over a thick bra or a bulky top, which adds inches to the bust and pushes you into a larger row than you need. Measure over a thin, unpadded bra or no bra, with the tape level at the fullest point. The second mistake is using a garment measurement instead of a body measurement: measuring a favourite blouse laid flat and comparing it with a body chart will overstate your size by the amount of ease in that garment.
Blouse sizing tool
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Enter bust, waist and hip measurements to estimate a starting blouse size.
Frequently Asked Questions
Which measurement matters most on a blouse size chart?
Bust measurement usually sets the starting size, because a blouse must close over the bust and its button placket must lie flat.
What if my bust and waist fall in different sizes?
Start with the bust size, then check the waist shaping. A blouse with darts can often be adjusted at the waist more easily than at the bust.
Do blouse size charts use the same ranges everywhere?
No, brands grade their charts differently, so the same label can cover a different bust range at two brands. Always read the chart of the brand you are buying.
Should I choose the larger size when I fall between rows?
For a woven blouse with no stretch, the larger size is usually the safer starting point, because you need room for the placket to close and for movement.
Does a blouse size chart cover sleeve length?
Most general charts do not. Sleeve length is usually given separately by the brand, or it follows the size range with taller sizes offering longer sleeves.