While it is summer in Ireland (I visited in June) it can still be a bit chilly. When the sun is out you can get away with a t-shirt, but layering is still the best way to plan.
Tops (think layering):
2 Tank tops
2 Long sleeves
Workout shirt
Sleep shirt
2 Cute sweaters
Dressy top
Jackets:
Rain shell
Fleece
Puffy quilted jacket
Comfy sweatshirt
Bottoms:
Blue jeans
Black jeans
Long leggings
Crop leggings
Warm leggings
Sweats
Misc:
Running shoes
Teva Foxy booties
Gloves
Beanie
Scarf
Sunglasses
Workout resistance band
Umbrella
Sleep mask
Toiletries:
Moisturizer
Sunscreen
Tinted moisturizer
Face wash
Shaving cream
Razor
Toothpaste
Toothbrush
Hairbrush
Hair ties
Eye drops
Tweezers
Makeup
Q-tips
And everything in my Wandrd PVKE 21L bag << see What to pack in a carry-on for long flights or layovers.