Nick here from Shopify.
I want to be sure I fully understand what you're asking. When you say "somewhere I can go to view a selection of these types of rebrandable clothes, to make a better decision on which ones I would like to use ? As looking in a catalogue or website doesn’t give you much to go by." do you mean a physical location somewhere?
I did find a good website which has a mix of Fruit of the Loom and Gildan (and more) which gives you an idea of what kind of products they have for you to buy wholesale to rebrand and sell again. It's called FireLabel Merchandising and you can see it here. I also found another website called Ralawise here. To find a physical location for this, can you confirm what country you are based in? It might also be worth reaching out to these websites to see where exactly they are located and if it's possible to visit if they're close by or if they know anything about a physical store visit. These websites seem to be primarily UK based and would more than likely know better than anyone about it.
I know that might not be an exact answer and apologies for sharing websites you might have already looked up. I do hope this helps give you an idea for the next best step to take.
All the best, Nick
If you aren't able to find a physical location, I recommend ordering samples for yourself from a Print on Demand supplier like Printful. They're pretty cheap and will give you the best sense of the feel/material of the garment.
In addition to giving you a sense of how the garment looks/feels, sample orders will also allow you to do your own product photography.
Sorry I should have been a little clearer, yes I did mean a physical location, so I could hope to get a better understanding of the quality and feel of each garment I am looking at getting. I am based in the UK (south east).
I have looked at one of those website before an I do appreciate you adding these in your response so I can look at some I may not of heard of before.
As for reaching out to these websites I hadn’t even thought of that, so I will also give that a try.
@ProductPro also makes a great point about doing some testing and using the product for your own photography which is definitely something to consider moving forward. By using your own photography rather than the images the website/ manufacturer has you are really making the website your own.
All the best, Nick