套衫 Origin — Dong Chinese Dictionary

tàoshān

pullover

tào cover

A cover has to be big (大) and long (镸) enough to wrap around what it is covering.

大 Meaning component

dà, dài big

镸 Meaning component

cháng long

镸 is a component form of 長.

	Old Chinese
Zhengzhang	tʰaːw
	tʰaːws

Phonosemantic compound. 衤 represents the meaning and 彡 represents the sound.

衤 Meaning component

yī clothes

衤 is a component form of 衣.

彡 Sound component

shān, xiǎn hair

Regular Modern

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	Middle Chinese	Old Chinese
Zhengzhang		sroːm
Unicode	shram

《說文新附》：“衫，衣也。从衣，彡聲。”