Hi to everyone who has responded! Unfortunately I had to take some time off from researching, but I'm back! I want to respond specifically to some of you...
Annie (Rosinish) thanks for your suggestion in reply#6, you said "You can then possibly find your relatives on census' as Mill Workers or similar & from the clothes dating find which companies were around such as Jute/Flax Mills?" and in reply#10 you said "finding out a date from the clothing would be a step forward. From that you could establish where your family were at that time & what factories were around at that time?" - unfortunately most of my family lived in Dundee and worked in the mills for several generations, and as Dundee was the jute capital of the world and had so very many factories, I'd say that it's definitely going to be a struggle, so I'm looking for another way to narrow it down. Just hoping that someone recognises the building or a person, then I can use that info to point me in the right direction.
Marjorie McLeish, you said in reply#7 "I am more then certain the gentleman on the left is my husband grandfather William McLeish! ... I have a few Pictures of him as well if you would like to see" but you didn't know how to add them - when you are replying, use the 'attachments and other options' below the text box and then attach a photo from your computer. Would love to see the man you mentioned! Also in reply#12 you said your ancestors were at 45 Cotton Road in Dundee. When was this? My ancestor's siter Mary Wilson and husband James Whyte lived at this address with their family in 1941! Any connection do you think?
Douglas Dickson, in reply#14 you said "I found your picture interesting the gentleman on the right looks like my grandads double myself and my grandad are Dicksons, my great grandfather was originally from Dundee." Well, I know of some connection to Dickson - an ancestor's sister, Adeline Massie, married Thomas Dickson Hutcheson in Dundee in 1904. They lost a 9 year old son in 1915 (fell in river Tay). Any connection at all do you think?
Thanks again to all who are making suggestions!