The Rule Of Three
Let’s talk about one of my favourite proportion tricks, the Rule of 3, and how it applies when layering jackets and tops.
If you’re wearing a jacket over a top, the length really matters.
Here’s the simple rule:
Your jacket should either be shorter than your under top
OR
Your top should be tucked in so your jacket becomes the longest layer.
Why?
Because when your top and jacket end at the same spot, it chops your body in half and adds unnecessary bulk, especially side-on.
That 50/50 proportion rarely does us any favours.
But when you follow this rule, you create that flattering 1/3 to 2/3 visual line, either with the jacket as the shorter feature or the longer outer layer.
It instantly elongates your shape and creates harmony in your outfit (yes, please!).
So next time you throw on a jacket, have a quick check in the mirror:
Is your under top hanging just below your jacket? Great.
Or is your top tucked, letting your jacket hang lower? Perfect.
If they’re ending at the same spot… it might be time to switch things up.
So what happens in Summer or if you live in a warmer climate and can't use layers? Does the rule of 3 still matter?
Yes, it still matters, but it works a little differently.
When you're wearing just two light pieces (say, a top and shorts or a dress and sandals), your natural body shape is already more visible, so you’re not at risk of adding that “boxy” effect like we often get with heavier layering.
We can see movement and feel your silhouette.
The key in warmer weather is still creating length visually, but instead of relying on actual layers making a 3 level system, you can use tricks like:
Tucking tops to change proportions
Choosing high-waisted skirts, pants and shorts to create that one-third top, two-thirds bottom ratio (this is the natural lengthening proportion).
Wearing dresses with strategic seam placement or shape (like diagonal seams or a cinched waist).
The Rule of 3 is all about where the eye lands, so even without layers, you can guide the eye and create length using lines, shape, and proportion.
