Lost 6kg but it’s not noticeable

I’m a 42yo F, 160cm tall and currently at 73kg. I weighed 79.8kg in January. I’m on a calorie deficit eating 1500 to 1600 calories per day and walk 10-12k steps 6x a week on my walking pad with 6.5 speed. But nobody notices that I lost weight. Even if I compare photos that I have taken, I do not see a difference. I can see that my tummy has gotten smaller compared to a month ago. My back fat/rolls have also decreased. But when I wear my usual work clothes/uniform I look the same. My face did not significantly shrink too. Why is that? It can be very frustrating. When I was younger, losing 5lbs showed significant change on my body ang people commented that I lost weight.