"Je crois que tu as mis ton T-shirt à l'envers."

Translation: I believe you put on your T-shirt backwards.

[BarbaraSeifert]

We would say in England 'l believe you put on your T-Shirt back to front'

[MichelLemoine123]

Bonjour Barbara,

In French, the adverbial phrase "à l'envers" can have three different meanings.

1) à l'envers (le devant derrière) → backwards (back to front)

"You put on your T-shirt backwards." → "Tu as mis ton T-shirt à l'envers."

2) à l'envers (l'intérieur à l'extérieur) → inside out (outside inside)

"You put on your T-shirt inside out." → "Tu as mis ton T-shirt à l'envers."

3) à l'envers (la tête en bas) → upside down (head down)

"You put on your T-shirt upside down." → "Tu as mis ton T-shirt à l'envers."

[JBaer1]

Michel - Thank you for that explanation. I came to the discussion looking for just such information. Super helpful!

[POISSONJos]

And do you say '' back to front'' if you can see the seams..
Because in French we have two different expressions.
À l'envers if you can see the seams of the T-shirt. Sans devant derrière if you can see the back instead of the front of the T-shirt.

[BrianBoru4]

If you can see the seams that's 'inside-out'.

[ppkzH80V]

and if it's both inside out and back to front?

[GraemeSarg]

That's "the wrong way round" (twice over!).

[Isaac433425]

Should "inside-out" be accepted as well (instead of backwards)?

[doublelingot]

It should. 'Upside down' (very unlikely) is accepted on the other hand.

[Kateh1000]

Wouldn't 'back to front' be better?

[jeanv]

I believe you have put your tshirt on backwards.-better English!

[SteveTruon1]

Accepted: I believe you put your T-shirt on backwards.

[effyleven]

Surely it is, "...HAVE put on.. " otherwise there is a conflict of tenses?

[GraemeSarg]

"You put" here is Simple Past (although indistinguishable from Simple Present), so no conflict.

[Margaretva679879]

Back to front is correct.

[Norman491209]

You have put your t shirt on back to front in UK English

[SueF77899]

'I think that you have put you t-shirt on back to front' is ok isn't it?

[GraemeSarg]

That should be accepted.

It's certainly better than Duo's translation, because T-shirts can't go backwards!