Four percent elastane appears in the lining entry for the Delamere polka-dot halter mini dress. The main fabric is listed as 100% polyester, and the complete dress is described as non-stretch. These statements refer to different things. The lining figure is not a reason to order a tighter size on the assumption that the whole dress will expand.

Keep the three fields on their own lines

Main fabric

The supplied composition is 100% polyester. This is the main-fabric entry, not the composition of every component combined.

Lining

The separate lining entry is 96% polyester and 4% elastane. It describes that component; it does not quantify how far the finished garment can extend at the bust, waist or zip.

Overall stretch

The listing says non-stretch. Use that as the stated fit characteristic unless more specific, verified information for your selected version becomes available.

It would be misleading to average the two fabric entries into a new percentage for the whole dress: the component weights are not provided. It would also be misleading to turn the lining’s elastane content into extra centimeters of body allowance. Neither calculation is supported by this listing.

Tie, zip and bust strip do different jobs

The construction details name a halter neck tie, an invisible side zip and an inner silicone strip at the bust. A neck tie gives you a fastening to consider around the neckline. It does not replace a suitable fit through the fixed body of the dress. Likewise, the side zip provides a way to open the garment; it is not a stretch panel.

The bust strip is a documented construction detail, not a measured support or stay-in-place result. If a particular amount of bust coverage or support is essential to your outfit, request a close view and the relevant measurements instead of relying on that one field.

Use the dress chart with a clear definition

The item-specific S row gives bust 84 cm, waist 72 cm, hip 94 cm and length 64 cm, with approximate inch values alongside. Those figures are preserved on the product page. The source does not establish whether the circumferences describe the garment or recommended body measurements, nor where the length starts.

Resolve that definition before calculating room between your body and the dress. If they are garment measurements, compare them with a similar non-stretch, lined dress that fits the way you want. If they are body guidance, compare body measurements using the specified method. The garment-versus-body measurement guide explains why the two comparisons are different.

Current design labels are Black / White and black 2, in s–xl. The labels do not establish a construction difference between versions. Confirm the selected one, settle the body fit and length, then assess the halter tie position. Keep the lining percentage in its proper place: a component description, not an undocumented promise of stretch.