The white-collar sweater is labelled button-up and offered in Black or Gray. Its text does not say whether the white collar is attached or removable. That distinction changes how you plan layers and laundering, so check a close photograph of the neckline before expecting it to behave like a separate shirt collar.

Read the fit note against the chart

One model entry describes L as fitted and XL as loose for a 180 cm, 68 kg wearer. The product chart moves from L chest 122 cm, shoulder 63, length 76 and sleeve 51 to XL chest 124, shoulder 65, length 77 and sleeve 52. That is a 2 cm listed chest difference alongside a 2 cm shoulder difference. The note describes a single presentation; your own reference sweater is more useful than copying that model’s letter. Compare the chest and shoulder of a sweater you like, then consider where its collar sits beneath a jacket.

A plain trouser and unpatterned jacket could keep the contrasting collar visible without needing another collared layer. The listing specifies 100% polyester and does not state collar attachment, button function, stretch or care instructions. Request those details, and verify the selected Black or Gray image, if the contrast detail is the reason to buy. Do not infer that the collar can be detached or that the buttons open the full front from the title alone.