For summer clothes, I'm most worried about whether they will be see-through or not; where can I check this?

Even within descriptions from the same brand, there are products where the statements regarding transparency are exact opposites. A CAN CAN SLEEVELESS DRESS_WHITE is lined with a thin, soft lining so it is not see-through, and the silhouette remains clean^[1]. Conversely, for A BOAT-NECK TIE T-SHIRT_BEIGE, it informs customers in advance that it tends to be slightly sheer and suggests layering something underneath^[2].

The two sentences differ only in direction, serving the same function. This means the former can be worn out as a single piece just as it is, while the latter requires preparing an inner layer together with it. Among the 76 products collected this time, 26 products had lining mentioned in their descriptions^[3]. Generally, whether something is see-through depends not only on the thickness of the fabric but also on the presence or absence of a lining, so checking whether lining is mentioned in the description gives a rough idea. For light-colored clothes such as white or ivory, sheer transparency stands out more even at the same thickness, and apricot-toned innerwear is known to show through less than white innerwear in such cases.

hmmm, sheer transparency is information that is rarely confirmed through photos, so having both cases noted down—including when it is sheer, rather than just noting when it isn't—makes it much easier to make a judgment when buying.