Rashi on Exodus 25:4/רש"י על שמות כ״ה:ד׳

1ותכלת AND BLUE PURPLE — wool dyed with the blood of the חלזון (a kind of shell-fish), the colour of which was greenish-blue (Menachot 44a).

2וארגמן AND RED PURPLE — wool coloured with a kind of dye the name of which is ארגמן

3ושש — this is what we call LINEN (Yevamot 4b).

4ועזים is GOATS’ HAIR; therefore Onkelos translates it by וּמְעַזֵּי which denotes something that comes from the goats — not the goats themselves, for the Aramaic translation of עזים is עִזַּיָּא‎.