die Size
size
A word borrowed from English for clothing size or shoe size. It is used mainly in the fashion industry and retail.
Ich bin mir nicht sicher, welche Size ich bei dieser Marke habe.
I'm not sure what size I am in this brand.

size
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size
A word borrowed from English for clothing size or shoe size. It is used mainly in the fashion industry and retail.
Ich bin mir nicht sicher, welche Size ich bei dieser Marke habe.
I'm not sure what size I am in this brand.

'Size' is a word from English and is used in German almost exclusively for clothing and shoe sizes. You hear it especially when shopping for fashion.
Welche Size trägst du bei T-Shirts?
What size do you wear in T-shirts?
When asking about the size, you can say: 'Welche Size brauchen Sie?' (What size do you need?). A typical answer would be: 'Ich habe Size M' (I wear size M) or 'Ich suche das in Size 42' (I'm looking for that in size 42).
Haben Sie diese Hose auch in einer kleineren Size?
Do you also have these pants in a smaller size?
The word 'Size' (size) is often combined directly with the international letter abbreviations (S, M, L, XL) or with numbers for European sizes (38, 40, 42).
Für mich bitte einmal in Size S.
For me, one in size S, please.
mass / crowd
'die Masse' and 'die Size' can both have to do with size or measurement in a very general sense, but they are used in very different areas. 'die Masse' is a German word and, in physics, refers to a property of matter, that is, how much mass an object has. 'die Size' is an English loanword and mainly means clothing or shoe size in retail or fashion. Learners may confuse the words because both describe some kind of size. In everyday language about clothing, however, it is better to say 'Größe' or sometimes 'Size'; in physics or when talking about something close to weight, 'Masse' fits.

Im Online-Shop steht die Size direkt neben dem Preis.
In the online shop, the size is listed right next to the price.
Im Physikunterricht berechnen wir die Masse eines kleinen Metallstücks.
In physics class, we calculate the mass of a small piece of metal.