I´m not a show off

I usually wear dress in an informal way (or dress informally) but yesterday I had to get a suit for a wedding. On my way to work I popped into a shopping center.
It´s Is there a discount on this shirt ? I asked to the shop assistant.
It´s fifty per cent off, responded the sales clerk.
I took two shirts and headed to the fitting room. I tried both of them, none neither of which looked right on me. They didn´t fit me.
I´m not a show off but I like causing making a good impressión when I have to attend a wedding. So I left both shirts and went kept on strolling up to until I spotted one that was to my likely liking.

Very good. I hope you eventually found one that you liked!

"None" is normally used in this context when you have more than two choices. If you only have two choices, you would say "neither". For example:

"I tried on two shirts, neither of which looked right on me".

"I tried on three shirts, none of which looked right on me".