Generally speaking, each unique colour combination gets its own name. Wrap names usually consist of two elements: pattern and colourway. For example, Roses Noel refers to the Roses pattern, in the ‘Noel’ colourway (red warp, green weft).
Oscha mostly names her colourways based on colour alone, regardless of blend. This means that items with the same colourway name can be different blends or different patterns. Examples of this are Starry Night Nebula (100% cotton or 75% cotton, 25% wild silk) and Sekai Riva (cashmere blend or linen blend).
Colour variations may exist between wraps of the same name. For instance, wraps with an ecru weft like Nebula may slightly vary because ‘ecru’ means ‘undyed’, and undyed yarns have many subtle shades of creamy, musroomy colours. Have a look at the differences between the undyed yarns (warp & weft) in the Aiko, Serene and Vanilla colourways, for example! It seems that for these, the shade of the undyed yarn (and for the Vanilla’s, the blend, i.e. linen) defines the name of the wraps. Aiko is more musroomy while Serene is slightly lower contrast – but none of them as ‘low’ as the Ivory’s.
In a few cases identical colourways but different blends have received different names, for example Okinami Evie and Okinami Orkney.
Since the rise of preorders where wraps also need to be named, there has been no check on ‘unique’ colourways anymore, so a single colourway name may refer to two very different colourways. Oscha has also used colourway names more than once, for example Ladybirds Paris (purple and pink) & Raja Paris (bordeaux and red).