Oversized T-shirt or a bigger size: what’s the difference?

By MANLY · First published: 12 September 2026 · English edition: 19 September 2026 · Fit and sizing guide

You want a roomy T-shirt. Do you choose an oversized design or go up a size in a tee you already know? Start with the cut: where the shoulder seam sits, how wide the body is, and where the sleeves and hem end. Two tees labelled Small can give you quite different shapes.

The main image is MANLY’s photograph with its background cleaned using AI. The figures come from manual measurements and the original photographs below, rather than the edited image.

What does oversized mean?

The tee is designed with a roomy cut. Many designs have a wider body and a shoulder seam that extends beyond the natural shoulder, often called a dropped shoulder. Sleeve and body length depend on the design; an oversized tee does not have to be long.

A regular fit generally follows the body more closely. In this comparison, “regular” describes the cut, not its quality. Fit names vary between brands, so measurements give you a clearer comparison.

Why is sizing up different?

Moving from Small to Medium changes a model’s dimensions according to its size chart. The body may become wider and longer, with longer sleeves too. Those changes do not necessarily produce the shoulder position and proportions of a tee designed to be oversized.

A bigger size may give you a fit you like. If you get the width you want but too much length, try another cut instead of continuing to size up.

What did we find when measuring two Small tees?

We used two actual MANLY garments: the beige To be continued Tee as our regular-cut example, and the black tee from the Japanese-Influenced Oversized Snap-Pocket Tee & Wide Shorts Set. Both are Small. The black garment’s measurements refer only to its tee, not its shorts.

This compares two cuts with the same size label. It is not a Small-versus-Medium test of one model, so it cannot tell us how much any regular tee will grow when you size up.

How to read these figures: the owner confirmed 15 and 24 cm by measuring the garments manually. Each measures one side from the collar edge to the shoulder seam, not full shoulder width. All other figures are approximate readings from tape measures in photographs and may be affected by the camera angle and garment position. Chest figures are flat widths, not body circumferences. These measurements describe these two garments, not every colour or production batch.

Where can you see the difference in the cut?

The shoulder seam sits farther from the collar

In this example, the distance increases from 15 to 24 cm: a 9 cm difference despite both tees being Small. That shows a different shoulder-seam position. How far it drops down your arm depends on your body and how you wear the tee.

Chest width increases by more than body length

The black tee is approximately 63 cm wide when flat, compared with about 50 cm for the beige tee: an approximate 13 cm difference. The difference in body length is about 6 cm. In this example, width increases more than length, showing how the proportions differ.

Read sleeve length and body length together

The black sleeve is about 26 cm long, compared with roughly 21–22 cm on the beige tee. Its shoulder seam is also farther from the collar. Sleeve length alone therefore cannot show exactly where the cuff will sit. For body length, consider where you want the hem to finish with your trousers or shorts.

Should you take your usual size or size down?

Start with the garment’s measurements and fit note. Your usual size is a reference point. If you want less width, compare the smaller size’s measurements, remembering that its body and sleeves may also be shorter.

The black set’s product page specifically recommends one size down. Treat that as guidance for this design. Our table describes one Small tee and does not provide the dimensions of the set’s other sizes.

How can you compare before ordering online?

1. Lay a tee with a fit you like on a level surface without stretching it.
2. Measure chest width from underarm to underarm. Compare garment width with garment width.
3. Measure body length from the high shoulder beside the collar to the hem, and sleeve length from the shoulder seam to the cuff. Confirm that the product chart uses those same points.
4. To compare shoulders with our figures, measure one side from the collar edge to the shoulder seam. Do not compare a full shoulder-width measurement directly with 15 or 24 cm.
5. Decide what you want to change: more width, a lower shoulder seam or less length. Compare all the dimensions and ask for any missing measurement that matters.

Which option suits the fit you want?

If you want a wide body and dropped shoulder, look for a cut designed with those proportions. If you like a regular tee’s shape and want extra room, a bigger size may work when the body and sleeve lengths suit you. Neither option is best for everyone.

Explore the To be continued Tee and the black oversized tee and wide shorts set on their product pages. These links identify the garments. Size availability changes, and a live page does not mean every size is in stock.

Before choosing, work out the width, length and cut you want alongside your size label. Our photographs and measurements show how much two Small tees can differ.

Source: two actual Small garments, manual measurements and original photographs supplied by MANLY’s owner. This comparison covers fit and dimensions only.