Wearing
Layering
Invisibility is a solvable technical problem. It comes down to surface, edge and colour, in that order.
Underwear becomes visible in three ways: through the fabric, as an outline under it, or as a shadow of a different colour. Each has a different fix, and applying the wrong fix is why people conclude that a garment simply cannot be worn.
Surface
A seam, a lace edge or a decorative texture will telegraph through a fine knit. The fix is a continuous surface: a moulded or bonded cup with no seams on the outer face. See t-shirt bra. Under a heavier or textured outer fabric the problem disappears entirely, which is why a seamed cut and sewn bra is fine under a shirt and obvious under a fine merino.
Edge
Every edge on a garment is a potential line. Brief edges show across the seat, band edges show under a fitted top, and a leg elastic shows on a fitted trouser. The hierarchy of solutions, from most to least effective: a bonded or laser cut edge, which has no bulk at all; a picot edge, which is flat but has some texture; a folded and stitched elastic edge, which is the most visible.
The counterintuitive point is that more coverage is often less visible than less. A full brief with a bonded edge, worn under a fitted skirt, puts its only edge at the waist where a waistband already exists. A mid coverage brief puts an edge across the widest part. See shapes.
Skin tone under white, not white. White fabric under white fabric shows as a brighter patch, which is the opposite of what is wanted.
Colour
Under a white or pale garment, a bra close to the wearer's own skin tone disappears and a white bra shows as a distinct lighter shape. This is straightforward optics: white fabric reflects more light than skin, so it reads through a thin layer as a brighter area. The same logic applies under any pale colour.
Under dark clothing, colour barely matters. Under a mid tone or a print, anything close to skin tone remains the safest choice. A single skin tone set covers more situations than several colours do.
The slip
For anything that clings, generates static or is slightly transparent, a slip solves all three at once and is far more effective than adjusting the underwear underneath. Slip and camisole covers the fabrics and the length rules. It is the most useful and least used garment in this section.
Necklines
| Neckline | Bra | Notes |
|---|---|---|
| Crew and high neck | Full cup or moulded | Anything low shows a cup edge under a close knit |
| Wide or boat neck | Balconette or a bra with narrow set straps | Wide set straps sit outside the neckline |
| Deep V | Plunge with a low centre gore | A standard gore shows in the opening |
| Halter | Convertible with a halter setting | Not a normal bra with straps crossed over |
| Racerback | Convertible with a crossback setting, or a leotard back | Standard straps will show |
| Low back | Low back adaptor, or a bodysuit | The band still has to sit below the bust line to support |
| Sheer | Moulded, skin tone, no lace | The bra becomes part of the outfit and should look deliberate |
Under trousers
Fitted trousers in a fine or stretch fabric are the hardest case, because they are close to the body over a large area and any edge shows. The reliable answers are a bonded edge brief, a seamless short, or a thong; a folded elastic edge will show under almost anything fitted. A brief one size up in the same fabric is not a solution, since the edge is still there and now sits looser.
Where a waistband stacks on a trouser waistband, drop the rise rather than the size. A hipster under a mid rise trouser sits below the trouser band and disappears; a high rise brief under the same trouser creates two bands in the same place.