Unless your hair is thick and mid shoulder length and a little wavy you are going to have problems disguising your clip in extensions. Clip in extensions are really only a temporary hair cosmetic makeover. They are usually used to add extra volume and length for a special occasion. ...More >
I know that most girls find them cheaper and more convenient to use each day, but they do have limitations.
It would appear to me that you are looking for a much more versatile hair enhancement solution, especially as it look as though you like to change between having a straight look and curly look. I suggest you have a different hair extension technique applied that will give you more security, less track detection and the ability to style the extensions how you like. I recommend the Hook and latch or the Micro ring track techniques.
They are both flat to the touch and allows you a degree of flexibility. However all hair extensions come with a certain amount of limitations and how you prepare them and look after them will help to maintain the illusion of beautiful healthy hair.