Reference: I’laam al-Mu’aasireen bi-Fataawa Ibn ‘Uthaymeen – Page 366
Question: What is the ruling regarding wearing clothes which have pictures [or images] of things and different scenic views?
Response: Every [item of] clothing which has any sign of [something] prohibited, then wearing it is prohibited. Clothing which has prohibited pictures [or images] is not permissible [to wear], [just] as those which have pictures [or images] of musical instruments, or [anything] inviting to prostitution. From what we hear, there are t-shirt which have immoral words written on them – [the wearing of] these are also prohibited. As for [clothing] upon which are pictures [or images of a similar nature] then the prohibition of wearing them is increased.
If we, the people, were advised to boycott [the wearing of] these, then this would cease to be a common practice amongst us, sadly however, some of us follow others without careful thought.