English to Bulgarian Other Textiles / Clothing / Fashion Lingerie

Здравейте,
Имам нужда от малко помощ, свързана с превода на тази дума. Благодаря предварително. Ето и част от текста.

Suppliers must ensure that there is at least a centimeter of wireplay under the arm.
This is because the garment could shrink slightly when washed.
Wireplay is required so that the wire can still move within casing.