I am here to tell you, it is okay if you do not have this feeling. If you love something you do not have to become emotional in order for it to be the one for you. I had troubles myself accepting this when I was wedding dress shopping myself. I went to two different stores and I got a little emotional at the first one when I tried on a dress I loved. However, I knew it wasn't the dress I would want to have the day of my wedding because it had an under layer of glitter that I was not a fan of. This made things difficult at the second store about a week later because I wasn't even considering the first few dresses I tried based off the look but that feeling I had. Looking back at the pictures my friends took of those first few I LOVE them! That thought that I had to feel emotional in the dress kept clouding my judgement. About half way through I started telling myself to just look at these dresses compared to what I want. They had almost the exact same dress without the glitter and it took me telling myself to change my mind set for me to realise that that was the right dress for me.
You do not have to get emotional and have 'that feeling' to find the perfect dress!