مخفي تحت الشريط (الأمامي)
مخفي تحت الشريط (الأمامي) المزدود
مخفي تحت الشريط المزدوج

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placket هو عبارة عن شريط مزدوج (من طبقتين)من القماش



In modern usage, the term placket often refers to the double layers of fabric that hold the buttons and buttonholes in a shirt. Plackets can also be found at the neckline of a shirt, the cuff of a sleeve, or at the waist of a skirt or pair of trousers.

Plackets are almost always made of more than one layer of fabric, and often have interfacing in between the fabric layers. This is done to give support and strength to the placket fabric because the placket and the fasteners on it are often subjected to stress when the garment is worn. The two sides of the placket often overlap. This is done to protect the wearer from fasteners rubbing against their skin and to hide underlying clothing or undergarments.
https://en.wikipedia.org/wiki/Placket


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Note added at 50 mins (2019-06-26 17:46:11 GMT)
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أو
مخفي تحت شريط الأزرار الأمامي

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Note added at 3 hrs (2019-06-26 20:06:57 GMT)
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المزدوج و ليس المزدود

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Note added at 4 hrs (2019-06-26 21:47:17 GMT)
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your success is ours; we take pride in your excellence

الزر الأمامي مغطّى/مخفيّ بسديلة

واقترحتُ هذه الكلمة لأنها مشتقة من الفعل سدل ومنها نقول ينسدل الستار

والله أعلم