CHOICE OF MATERIALLayers in your outfit can make items easily disappear or simply put: no longer stand out. That's a shame. With plain colored items the tip is : mix materials . To give a few examples: quilted cotton with lurex, leather with wool, silky items with denim. Then you don't need a lot of color or print.
THE SIZENot every item is layer-proof. Logical that you don't wear a size L item under a size S, if you know what I mean. With a simple 'good to know', you ensure that you can always wear layers. View the sleeve inset, e.g. of your basic item. A dropped shoulder (lower sleeve inset) indicates that the shape is straight/boxy. What you are going to wear over it must therefore be larger, if it wants to sit comfortably. Then choose the waistcoat, for example.
Viewing tip: ' how to layer ' reel by @zijenstijl containing 3 different items from House of Nilay. The reversible waistcoat, kantha kimono & quilted kimono jacket.