This is the 5829th most frequent French word.
coscto
It seems "coscto" is not a standard French word. Could you mean "costo"? If so, it means "strong" or "tough."
Here, 'costco' is used informally to describe something as being sturdy or durable, deriving its connotation possibly from the characteristics associated with the retail chain Costco.
Lors de son voyage, il a acheté des bagages très costco pour transporter toutes ses affaires.
During his trip, he bought very sturdy luggage to carry all his belongings.
In this case, 'costco' is a direct reference to the products offered by the Costco store, emphasizing their quality and price advantages.
Elle préfère les produits costco pour leur rapport qualité-prix remarquable.
She prefers Costco products for their remarkable value for money.
Here, 'costco' metaphorically describes the robustness or solid quality of the clothing, again potentially borrowing from perceptions of Costco products.