Stock moves fast
The business is built on frequent small deliveries rather than long seasons. Something seen one week may be gone the next and not restocked.
Practical effect for a gift card: encourage them to spend it when they see something, not to save it. Saving a card here is more likely to mean missing the thing they wanted than getting a better price later.
Sale periods
The retailer runs defined sale periods rather than continuous discounting. A card given shortly before one is worth noticeably more in practice — see sales events and gift card timing.
That is in tension with the advice above. The honest resolution: if they have something specific in mind, spend now; if they are browsing, wait for the sale.
In store and online
Cards generally work both ways within the same country. Online returns and in-store returns are handled differently in some markets, which matters given the return rate in this category.
Group brands
The parent company owns several other retail brands. A card for one of them does not usually work in the others — they are separate stores with separate systems, despite the shared owner.
If the recipient shops across the group, check which brand they actually want.
Region
Country-specific, and the online store is national. A card bought in one country will not spend in another.
Returns
Refunds return as gift balance, not to a bank card. In a category with this much returning, that is worth stating up front.
Asking for one
Country and amount. Timing a clothing card against the sale periods is covered in the fashion guide.