"Dia tidak mengganti kausnya."

Translation: She does not change her t-shirt.

[AbdullahAAK]

So
Mengganti = to change clothes
Mengubah = to change otherwise
?

[aarspar]

"Mengubah" means to change (in general) while "mengganti" means to change something with something (as a replacement).

Example:
I change you = "aku mengubahmu", but, I change my car (with a new one) = "aku mengganti mobilku"

You change your clothes with other clothes, so it uses "mengganti" instead of "mengubah".

[jr.m4rks]

Thank yoou

[jr.m4rks]

I see you are learning Portuguese and you are from Indonesia. So I'm brazilian. If you want pratice portuguese and help me praticing Indonesian just add me on Instagram and we check how can we do that: @jr.m4rks

[aarspar]

Oh hai there! My Instagram is aarspar too. Feel free to check.
(I'm just to shy xD)

[Dakota553943]

Is there a reason why it only accepts him, and not her?

[Harvey384140]

Tee shirt is quite commonly used and should be accepted

[Adnan2805]

I find Tee shirt is not correct yet it is how its written ?

[aarspar]

It's written as "T-shirt" or "t-shirt". I've never seen somone wrote it as "tee shirt"

[firda_fairuz37]

Pantesan bau nya smpe sini

[fhwqhgads]

Shirt normally means T-shirt. It should be acceptable.