T-shirt bra

• A continuous surface with no seam lines under thin or clingy fabric.
• A consistent shape that does not change through the day, because the shape is in the foam rather than in the fabric tension.
• Opacity, which is why it is the default choice under a pale or thin top.
• A small amount of protection against pressure, which some people want and others do not think about at all.
• Predictability. The same garment produces the same silhouette every time.

A moulded cup is a fixed shape and cannot adapt. A cut and sewn cup made of fabric panels will accommodate a bust that is slightly fuller at the bottom, or slightly asymmetric, or changing across the month, because fabric moves. Foam does not. If the shape of the mould does not match the shape of the breast, there is no adjustment available and the answer is a different garment.

Foam is also warm. A moulded cup traps a layer of air against the chest, which is welcome in February and noticeable in August. And the foam itself has a limited life: it takes on a permanent crease if folded, and it eventually softens and loses its shape independently of the elastic.

Never fold a moulded cup inside out to save drawer space. The crease is permanent and there is no way back from it.

1. Look at the top edge in profile. It should meet the chest with no gap and no compression line.
2. Press gently on the top of the cup. If it collapses inwards and stays hollow, the volume is too large for the tissue in it.
3. Look for a horizontal crease across the front of the cup. That is the foam buckling because the tissue underneath is not filling the lower half.
4. Check the outer edge under the arm. Moulded cups have less side containment than seamed ones and will show a bulge if the cup is too narrow.
5. Wear it for an hour before deciding. A moulded cup that is slightly too shallow feels fine at first and produces a distinct pressure line later.

These are three different things and are frequently confused. A moulded cup uses foam as structure, at even thickness, to hold a shape. A padded cup adds material to increase apparent volume. A push up adds material specifically at the bottom and outer edge to redirect tissue up and inward. A t-shirt bra may be any or none of these, and a lightly moulded cup with no added padding is widely available and often the more comfortable choice.

Moulded cups fail from creasing and from heat, not from wear. Wash by hand or in a structured bag on a cool delicate cycle. Never wring. Reshape the cups with the hand while wet, then dry flat with nothing resting on them. Store cup inside cup only if the cups are the same size and nothing is pressing on them from above, and never fold one into the other.

A drawer that is too full is the most common cause of permanently creased foam, which is one of the practical arguments for owning fewer bras and keeping them properly. Drying and storing and the capsule drawer both cover this.