You have touched the most common when you speak of eye contact. In today's world that may or may not be a good indicator. That other person might just be trying to figure out your hair, outfit or art work. You may be just trying to do the same. On this subject i think you will find we are all just a little different. The possibilities are endless. The other two you mention both are a indicator that she has a interest in you. You don't take a hat or shirt from a guy you're not interested in unless you're collecting for a clothing drive. Your flattered by her picking you a turn on as you say
I think of a eye contact that turned into a very exciting weekend. Traveling no real timetable, nice looking man sitting across the bar while having lunch. We exchanged glances for a few minutes before he came to my table. He mentioned my looking followed by do i know you. I of course started to tell him i wasn't looking and then he hit me with a great response. He was sorry I must have been looking at the monkey on his shoulder. It made me laugh, i like a man with humor. I ask him to sit my wine his two beers and a plate of fries later we checked into a motel. He was half way through a four day pass . We spent two days i will never forget because of eye contact.
Touch can be a turn on if it's the right kind not a grope only a touch. I had that a few times. First time in college big group out for drinking and dancing. A guy i had never paid much attention to sat between me and another girl at a table that seated twelve. I had danced with other guys he with other girls. When we were seated and my hand was on the table his touch. A single finger tracing the top of my hand. Every time i returned to the table if we were both there that finger. A look a smile very few significant words passed between us. Next thing i knew we were holding hands and when we all left i went with him. The first of three great nights we spent together. Because the tenderness of his touch turned me on.