Article Summary
Choose a stand collar for an upright neckline if it closes over your usual layers without crowding your jaw. A round neck leaves more of the inner neckline visible. Check the exact closure and hem before ordering.
What a Stand Collar Does When You Close the Coat
You found a fur coat that looks right open over a fine sweater. On the way out the door, you fasten it over the ribbed turtleneck you wear to work and the collar rides up toward your jaw. That is a reason to compare the necklines with the coat closed. A stand collar rises beside the neck. A round neckline leaves more of your inner layer visible. Choose with the knit or scarf you expect to wear outside.
Look for the edge that continues above the front opening. On a stand collar it rises away from the body of the coat instead of lying flat against the chest. That gives the neck a frame even if the coat is open. The fur around that frame takes up space as the sides come together. A fine crewneck leaves more room for the collar to do its job than a thick roll-neck does.

The Legacy Mink Pastel Stand photo shows the raised edges with the front open. A photo from that angle gives you the outline. When you try the coat on, close it to the point you would normally use, lower your chin and turn your head each way. If a soft collar brushes your neck, that may be comfortable. If the coat rides up or pushes your sweater into your jaw as you turn, try the same coat with the fine layer you would wear to dinner. If the problem clears with the fine layer, decide which outfit you are actually buying for.
Why a Round Neck Shows More of the Layer Underneath
The neck opening stays in view when the front is closed. A low, rounded edge can leave a turtleneck visible without surrounding it with upright fur. It also lets you show a shirt collar or small piece of jewelry if you want the opening to look finished indoors.

The Legacy Mink Pastel Round photo shows the inner top above that curved edge. Both photos show the seller's Pastel options. Their clothes and poses differ, so the useful comparison is the shape at the neck. With a scarf, check how the ends sit before you fasten the coat. A loose loop can rest outside the opening. Tucking a thick fold under the top fastening uses up the space you chose the lower neckline for.
Also check the hem after changing the collar option. The listing gives an M body length of 62 cm for Stand and 65 cm for Round. Those are two garment specifications. If your current coat is 63 cm long, the Round version may cover more of the knit or skirt below. Use the length from the correct chart and hold a tape against the outfit to see whether that matters to you. A lower neckline doesn't explain the longer hem. They are separate changes in this design.
When the V-Neck Is Worth Trying
A V-neck changes a different part of the opening. The sides angle down the front, so more of a blouse or knit may stay visible across the upper chest. A round opening gives a shorter, curved frame. If you are choosing an outer layer for a dress with a high neck, decide how much of the dress you want to show while the jacket is closed.

The Chic Sister Apricot Brown V-Neck illustrates that longer opening. Here the seller lists the V-neck in M at 50 cm long and the Standing Collar at 53 cm. It is a different jacket from the Legacy Mink, with different fur and cut. The useful comparison is how far down the neckline opens and whether the hem works with your own clothes. For additional ways to use high and low inner necklines, see fur coat outfits with knitwear.