ThirdLove vs Harper Wilde
Two brands, two ways of grading a size. Here is how ThirdLove and Harper Wilde differ in system, range and fit, and which one to choose for your shape and your problem.
ThirdLove or Harper Wilde, in short
ThirdLove and Harper Wilde both label in US sizing. ThirdLove runs true to size in the band and grades generous in the cup with average wires; Harper Wilde runs true to size in the band, true in the cup, average wires. Range: ThirdLove 30–48 / AA–H; Harper Wilde 30–46 / A–H. Convert your measured size into each and let fit decide.
Your measured size in both
Same body, two labels. Each result is your US size converted into the brand's system, then adjusted for how that brand grades. Same system, so the label matches: the fit adjustment is the difference.
ThirdLove vs Harper Wilde at a glance
| ThirdLove | Harper Wilde | |
|---|---|---|
| Sizing system | United States | United States |
| Bands | 30–48 | 30–46 |
| Cups | AA–H (I in select bands), plus half-cup sizes A½–E½ on 30–40 bands | A–H |
| Band grading | true to size | true to size |
| Cup grading | grades generous | true |
| Wire width | average | average |
| Straps | Standard, adjustable front | Standard |
| Alpha sizes | No | No |
| Tier | Mid-to-premium | Mid-market |
| Origin | US | US |
| Signature line | 24/7 Classic T-Shirt: memory-foam contour, the flagship, in half cups | The Base: lightly lined t-shirt bra |
Which to try for your breast shape
| Shape | ThirdLove | Harper Wilde |
|---|---|---|
| Full on bottom | 24/7 Classic Demi | The Base demi |
| Full on top | 24/7 Classic Full Coverage | The Bliss |
| Shallow | 24/7 Classic Wireless | The Flex |
| Projected | 24/7 Classic T-Shirt in a half cup up | The Base |
| Wide-set | 24/7 Plunge | The Bliss |
Not sure of your shape? Use the shape finder.
Choose ThirdLove or Harper Wilde?
- cups usually feel small on you elsewhere
- between two cup sizes
- memory-foam contour without gaping
- simple everyday basics
- broad grid at mid prices
Both are right at the same measurement. The label differs by system and the fit by grading: start from your measured size, convert into each, and let the five fit checks decide.
What each brand is known for
| ThirdLove | Harper Wilde | |
|---|---|---|
| Line 1 | 24/7 Classic T-Shirt: memory-foam contour, the flagship, in half cups | The Base: lightly lined t-shirt bra |
| Line 2 | 24/7 Classic Wireless: wireless contour | The Bliss: wireless contour |
| Line 3 | Classic Strapless (runs tight in the band) size the band up | The Bralette: alpha-sized |
| Line 4 | Sport: bra-sized sport | The Flex: light support |
ThirdLove vs Harper Wilde: answered
Is ThirdLove the same size as Harper Wilde?
Same notation (US), different grading. ThirdLove: Bands run true to size: start with your measured band on the loosest hook. Harper Wilde: Bands run true to size: start with your measured band on the loosest hook.
Which runs smaller, ThirdLove or Harper Wilde?
ThirdLove (Cups grade generous) try your measured cup and one down. Harper Wilde. Cups grade true to the measured difference.
Which is better for a large bust, ThirdLove or Harper Wilde?
ThirdLove runs to AA–H on bands 30–48; Harper Wilde to A–H on 30–46. The one whose range covers your size (in its own system) and whose wire width suits your root.
Which is better for a small bust?
Whichever grades true or small at A–C: ThirdLove cups grades generous, Harper Wilde cups true. Small bands need the brand whose range starts lower: 30 vs 30.
Can I use my ThirdLove size at Harper Wilde?
Convert first (same system, so the label carries), then adjust: Harper Wilde bands run true to size and cups true relative to true. The calculator above does both.
Do ThirdLove and Harper Wilde fit the same breast shapes?
Not identically. Full on bottom: ThirdLove 24/7 Classic Demi vs Harper Wilde The Base demi; Full on top: ThirdLove 24/7 Classic Full Coverage vs Harper Wilde The Bliss; Shallow: ThirdLove 24/7 Classic Wireless vs Harper Wilde The Flex.
Opens HauteFlair’s own hub page; use your measured size there. HauteFlair is owned by the same company as Brasize.ai; that relationship never changes the sizing math, charts, or fit advice on this page. How this site makes money.