one-sided
It's just lawyers, folks.
When Apple was sued by Microware a few years ago over the use of "OS 9", Apple got the case thrown out because, although they were both computer operating systems with similar capabilities (both ran Java, both ran on PowerPCs, both had I/O support for 1394/Firewire and could control camcorders, etc. etc.), Apple convinced the judge that since they competed in different market areas (embedded computers versus desktops), there was no confusion.
Thus, the product Microware OS-9, existing since 1980, and Apple Mac OS 9 were not enough alike for legal action.
But Apple can go after a clothing manufacturer. It's all about money and legal teams. Apple, Microsoft, Disney, etc. will usually win because they can afford to win. With enough money, there is no grey area
Now, *if* this clothing company was selling their clothing through electronics or computer stores, or online in a way that targetted Apple users, then Apple might have a reason for concern. But I did not read if this was or was not the case.