Begin with the label that is actually shown
Age, height and numbered sizes are not interchangeable. Note the exact label on each published product and compare it with the audience you serve. A photograph can show a style, but it cannot confirm fit or the included size range.
Read the whole series
If a product is sold as a size series, record every size and piece count before comparing prices. Two series with the same number of pieces may cover different ages. The product page is the starting point; ask the sales team to confirm the current assortment.
Compare like with like
Put two dresses intended for different celebrations on separate lines of your buying sheet. Record the model code, each size label, series quantity and total rather than comparing only the first displayed price. This makes differences visible when you later discuss the selection.
Leave room for confirmation
A saved product is a shortlist, not reserved stock. Share the exact links or codes with your advisor and ask which sizes and colours can be supplied now. Keep the confirmed version of the order as your reference.