Thong and G-String Underwear Manufacturing: Construction, Elastic and What to Specify (2026)

Quick answer. Thongs and g-strings normally run on a minimum of 2,000 pieces per style and colour, with trials from around 1,000. They are the most elastic-dependent construction in the category: with minimal fabric coverage, the waistband, the gusset placement and the back-piece join are what decide whether the garment is wearable — and the tolerance for error is smaller than in any other silhouette.

1. The family, and how the names actually differ

Thong is used commercially as an umbrella term, but the sub-types are distinct specifications.

• Thong. A narrow back panel that narrows to a strip, joined to a waistband. The most common construction in the family.
• G-string. The back is a string or cord rather than a tapering panel, so the construction depends almost entirely on the elastic and the join.
• Tanga. A wider back panel than a thong, by some definitions narrower at the sides — the boundary with a cheeky or a brief varies between suppliers.
• V-string and similar. Straps forming a V, usually with the least fabric of all.
• Cheeky. Not a string at all — a full front with a reduced back panel, which sits between a brief and a thong.

Because the definitions vary, the useful specification practice is to state the back panel width and the side width rather than the name. A name that means one thing to the buyer and another to the supplier produces a sample nobody agrees on.

2. Why this is the hardest silhouette to make well

• There is no fabric to absorb a mistake. A brief distributed over more cloth tolerates a small deviation in the block; a thong does not.
• The elastic is the garment. It holds the waistband, the gusset in position and the back join — so elastic specification carries more load here than anywhere else.
• Comfort is an engineering question. Friction and displacement are decided by gusset width, gusset placement and seam flatness rather than by fibre choice.
• The back join is a stress point. On a g-string it is the single most loaded join in the garment.
• Fit tolerance is tight. Because so little fabric is involved, a small grading error is visible immediately rather than distributed across the panel.

3. The specification decisions

• Back panel width and side width. Stated in millimetres, since the category names are not standardised.
• Gusset width and placement. Both affect comfort directly, and both are measurable rather than describable.
• Elastic specification. Recovery at low tension, and the width of the elastic at the waistband and the leg opening.
• Seam type and flatness. A thong has more seam length per square centimetre of fabric than any other silhouette, which is why seam flatness matters more here.
• Fabric and weight. Usually the lighter end of the range; the weight affects how the panel behaves under tension.
• Size grade. Confirmed per market and checked at both ends, since the tolerance is tight.

4. Elastic and edge finishing

• Waistband elastic width. A narrow elastic on a thong has to do the work of a wider one on a brief, so width and recovery are specified together.
• Leg-opening elastic. On this silhouette it also positions the gusset, so its recovery affects comfort rather than only appearance.
• Bonded or flatlock edges. Less bulk against the skin, and fewer needle holes — which matters where the edge sits under tension.
• Stitch density at the back join. The join with the highest load in the garment; a density specification rather than a description of quality.

5. MOQ, lead time and development

• Minimum. Around 2,000 pieces per style and colour, with trials from about 1,000.
• Round count. Expect at least two sampling rounds; the second is usually about gusset placement and elastic tension rather than the block.
• Sampling. 7–10 days on a stock block, 12–18 days for full custom development.
• Bulk production. 45–60 days after pre-production sample approval, 30–40 days on a repeat.
• Sea freight. 30–35 days to Europe or the US east coast.
• Peak season. August to October adds 10–15 days.

6. Common errors

• Specifying by name only. Thong, g-string, tanga and cheeky are not standardised, so the name alone does not describe the garment.
• Using a brief elastic. A waistband elastic that works on a brief usually does not carry a thong, because there is less fabric to distribute the tension.
• Treating the gusset position as cosmetic. On this silhouette it decides comfort rather than only appearance.
• Skipping the second sampling round. The second round is where gusset placement and elastic tension are settled — the two items that decide whether the garment is wearable.
• Judging on a flat sample. Fit and displacement only appear when the garment is worn, so a flat sample cannot confirm the specification.
• Ignoring the back join. On a g-string it is the most heavily loaded point in the garment.

7. How to compare two quotations

• Back and side widths stated in millimetres. The two figures that actually define the silhouette.
• Gusset width and placement stated. Both measurable, both comfort-critical.
• Elastic specification itemised. Width and recovery at the waistband and the leg opening.
• Seam type and density stated. Particularly at the back join.
• Minimum basis, trade term and validity. Per style and colour, FOB and the port, plus how long the figure stands.

Published: 2026-10-13 · Xiamen Unitex Trade Co., Ltd. — OEM & ODM underwear sourcing partner

Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — OEM/ODM underwear sourcing and supply-chain partner in Xiamen, China; in the trade since 2009, incorporated in 2013. Based in the Xiamen–Quanzhou–Jinjiang knitwear cluster, Fujian Province, south-east China.