I've been looking for a sheer silky sleeveless shirt for the past couple of months and after much searching I finally found one in River Island. It has quickly become one of those tops that you live in till it's falling apart because you want to wear it everyday.
I believe it was around £26 which I think is pretty reasonable for something that is well made. Personally, I prefer to spend slightly more on clothes, because when I buy items from shops such as Primark I end up hating them within a few weeks or they fall apart in the wash. And, if you buy a top for £10 from Primark that you wear for a few weeks or a top for £26 from River Island that you wear for years, it's pretty obvious which turns out to be the better buy.
White shirt - River Island
Denim Shorts - Topshop
Nail polish - Barry M Neon Pink