Free returns & exchanges

Thinking Mu Open-back organic cotton T-shirt | beige "pannacota rio top"

€35 €59 -40%
Size

Choose your size

We recommend you take your usual size.

In the photos, Manon is 1 m 74 tall and wears size S

Size guide
Size equivalents
Size XS S M L XL
FR equivalent 34 36 38 40 42

Free returns & exchanges · 30 days to send it back to us

At your door Thursday 12/11 · free delivery on orders over €150 Free returns & exchanges · 30 days to send it back to us Loyalty programme · 5% of the amount paid added to your credit Excellent on Trustpilot · 4.8/5, 2,993 reviews
This piece in detail +

Good to know

  • Opaque enough to wear on its own, despite its light colour.
  • It follows your shape without squeezing: the rib moves with you.
  • Demure at the front, bare at the back: one piece, two looks.

Material & feel

A ribbed organic cotton knit, soft and pleasant against your skin. The compromise: 3% Lycra. It's what brings the rib back into shape after stretching, and lets this close-fitting tee suit more body shapes.

When to wear it?

From May to September, as soon as it's warm enough to bare your back. It goes just as well from a day in town to dinner on a terrace.

Fit & size

The tie fastens around the waist: you adjust the hold yourself, tighter or looser depending on the moment.

We recommend you take your usual size.

In the photos, Manon is 1 m 74 tall and wears size S

Care guide

Machine wash at 30°C inside out, delicates cycle, do not tumble dry. Make sure the spin is set to 800 rpm maximum. Iron on low heat (110°C). Try a GuppyFriend Bag to protect synthetic fibres and reduce the amount of microfibres released into the washing water.
Material 97% organic cotton, 3% lycra
Country of manufacture India
Fit Fitted
Collar Round
Sleeves Short
Sheerness Opaque
In-store availability +
Lyon 1er
Unavailable
XS S M L XL
Paris 10ème
Unavailable
XS S M L XL
Environmental cost +

Calculated using the official French government method (Ecobalyse), across the entire life cycle. The lower the score, the lower the impact.

Official French government logo · Ecobalyse v7 regulatory method.

See calculation details ↗

This garment costs the environment 26% less than a conventional equivalent.

The conventional equivalent is the same garment made from non-organic, non-recycled materials in Asia, as is standard in the industry.

Climate change

5 kg CO₂e

6% less

Water used

916 L

89% less

Regulatory environmental labelling · calculated with Ecobalyse.

Delivery & returns +

Delivery costs

Free on orders over €150 in France, Belgium, Monaco, Germany, the Netherlands and Austria. Below that, €3 to a pickup point or €5 for home delivery. See other countries.

Delivery time

Estimated delivery: Thursday 12/11. We do our best to meet this date, but it may still change slightly. Sold and shipped by WeDressFair.

Returns & exchanges

Free returns & exchanges

You have 30 days from receipt to try on your items at home, at your own pace.

Not right for you?

Returns are free: we refund you to your payment method as soon as your parcel has been processed.

Wrong size?

Request another size from your account: the exchange is free, including the return and the new delivery.

How does it work?

In your account, click "Return or exchange", then download your label: there's nothing to pay.

How to make an exchange

Loyalty programme

Every order placed with your account earns you 5% of the amount paid in credit. It's added automatically at the end of the return period, then applied on the payment page of your next order. It never expires. Find out more.

Our commitments for this piece

  • 97% sustainable materials

    97% organic cotton, 3% lycra.

  • Vegan

    No animal-derived materials.

  • Verified workshops

    We have checked the documents provided by Thinking Mu about its production workshops and the materials used, against the criteria in our charter.

Our charter & our method

Our method

01

We seek out

We look for brands whose approach actually holds up, not the ones with the best marketing.

02

We analyse

We ask for workshop names, compositions and labels, along with the proof to back them up.

03

We validate

Without proof, a brand doesn't make it into our catalogue. It's the one rule that's non-negotiable.

Our selection charter · 3 pillars

01

Respect for people

  • All brands share the names of their partner workshops with us.
  • All of them commit to respecting the fundamental principles of the International Labour Organization.
  • When they manufacture in high-risk countries, we ask for additional guarantees and labels.
02

Care for the planet

  • 100% of the clothes we select are made from at least 90% organic, vegan, recycled or natural materials.
  • All brands give us proof, with labels and certifications: GOTS, OCS, Oeko-Tex, Bluesign…
03

Integrity and values

  • At least 75% of collections must be eco-friendly.
  • All of them commit to always doing better, never worse just to produce more.
View the full charter ↗

What our customers say

4.8 / 5
★★★★★ ★★★★★
4 verified reviews
5★ 3
4★ 1
3★ 0
2★ 0
1★ 0
ED
Elise D.
Verified purchase
June 2026
★★★★★ ★★★★★ Size XS · Ecru

This top is really comfy to wear, the fabric is good quality. It's original but really easy to match. I've had loads of great comments, especially about the back :)

Translated from French

CL
Celine L.
Verified purchase
May 2026
★★★★★ ★★★★★ Size M · Ecru

The t-shirt is really lovely (I got compliments as soon as I put it on), good quality, thick enough not to be see-through. On the other hand it's a bit short for my taste.

Translated from French

LD
Laure-anne D.
Verified purchase
April 2026
★★★★★ ★★★★★ Size M · Ecru

Really lovely material and original fit, I love it

Translated from French

MP
Melanie P.
Verified purchase
March 2026
★★★★★ ★★★★★ Size S · Ecru

The string at the back is long and ties around the waist, I was surprised when I got the t-shirt because you can't see it in the photo

Translated from French

Thinking Mu

// The brand

Thinking Mu

A pioneer of circular fashion, Thinking Mu turns innovative and recycled fibres into colourful, committed pieces. It guarantees full transparency and a minimal environmental footprint for every garment it makes.

Discover the brand

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Open-back organic cotton T-shirt | beige "pannacota rio top", Thinking Mu, photo 1
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Open-back organic cotton T-shirt | beige "pannacota rio top", Thinking Mu, photo 2
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Open-back organic cotton T-shirt | beige "pannacota rio top", Thinking Mu, photo 3
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Open-back organic cotton T-shirt | beige "pannacota rio top", Thinking Mu, photo 4

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