Chinese · Pronunciation Guide
yee-fu: a high level first syllable, then a weak toneless second. Note that 服 loses its rising tone entirely here.
yīfu
A plateau followed by a weightless tail. The neutralisation is worth noting because 服 carries a full rising tone as an independent morpheme — in 舒服 it is also toneless, but in 衣服店 and elsewhere it can surface with its tone. Whether a syllable reduces is a fact about the individual word.
Listen: 衣服
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这件衣服很漂亮。
Zhè jiàn yīfu hěn piàoliang.
This dress is very pretty.
Listen: 这件衣服很漂亮。
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这件衣服很漂亮。 keeps hěn at a full dip before the falling piào, so no conversion. Then liang fades toneless. The sentence therefore has two neutral syllables — fu and liang — and both sit at the pitch left by the syllable before, which is high in the first case and low in the second.
Restoring the rising tone to fu gives yī fú, which sounds over-articulated. Let it go slack. The level tone on yī is the other issue: with no consonant to launch it and nothing to close it, the pitch tends to drift, and it needs to be at full height from the first instant and cut cleanly.