The name “Subway” is associated with a restaurant chain that sells non kosher Sub sandwiches. This leads to a hashkafic issue among some, when this chain opens a store where the food is under a reliable hechsher. Those who do have this hashkafic issue, do they also have a problem with non kosher clothing made kosher (slits etc. properly repaired)? Do they have an issue with a clothing store known to push the envelope of pritzus that opens a store on 13th Ave in Boro Park that sells “kosher” clothing? (These are 2 different questions).
I can only answer for myself;
1) definitely not
2) I don’t know enough details; how the name brand is really perceived, are people attracted to the brand because of the negative associations or because of the quality, and mostly, whether the clothing sold there pushes the envelope in tzniusdik clothing (I do not wish to discuss the details of that last point for reasons of tznius).